CLEANUP: atomic/tree-wide: replace single increments/decrements with inc/dec

This patch replaces roughly all occurrences of an HA_ATOMIC_ADD(&foo, 1)
or HA_ATOMIC_SUB(&foo, 1) with the equivalent HA_ATOMIC_INC(&foo) and
HA_ATOMIC_DEC(&foo) respectively. These are 507 changes over 45 files.
diff --git a/src/http_act.c b/src/http_act.c
index e71a369..c699671 100644
--- a/src/http_act.c
+++ b/src/http_act.c
@@ -121,13 +121,13 @@
 	goto leave;
 
   fail_rewrite:
-	_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_rewrites, 1);
+	_HA_ATOMIC_INC(&sess->fe->fe_counters.failed_rewrites);
 	if (s->flags & SF_BE_ASSIGNED)
-		_HA_ATOMIC_ADD(&s->be->be_counters.failed_rewrites, 1);
+		_HA_ATOMIC_INC(&s->be->be_counters.failed_rewrites);
 	if (sess->listener && sess->listener->counters)
-		_HA_ATOMIC_ADD(&sess->listener->counters->failed_rewrites, 1);
+		_HA_ATOMIC_INC(&sess->listener->counters->failed_rewrites);
 	if (objt_server(s->target))
-		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.failed_rewrites, 1);
+		_HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_rewrites);
 
 	if (!(s->txn->req.flags & HTTP_MSGF_SOFT_RW)) {
 		ret = ACT_RET_ERR;
@@ -250,13 +250,13 @@
 	goto leave;
 
   fail_rewrite:
-	_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_rewrites, 1);
+	_HA_ATOMIC_INC(&sess->fe->fe_counters.failed_rewrites);
 	if (s->flags & SF_BE_ASSIGNED)
-		_HA_ATOMIC_ADD(&s->be->be_counters.failed_rewrites, 1);
+		_HA_ATOMIC_INC(&s->be->be_counters.failed_rewrites);
 	if (sess->listener && sess->listener->counters)
-		_HA_ATOMIC_ADD(&sess->listener->counters->failed_rewrites, 1);
+		_HA_ATOMIC_INC(&sess->listener->counters->failed_rewrites);
 	if (objt_server(s->target))
-		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.failed_rewrites, 1);
+		_HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_rewrites);
 
 	if (!(s->txn->req.flags & HTTP_MSGF_SOFT_RW)) {
 		ret = ACT_RET_ERR;
@@ -326,13 +326,13 @@
                                               struct session *sess, struct stream *s, int flags)
 {
 	if (http_res_set_status(rule->arg.http.i, rule->arg.http.str, s) == -1) {
-		_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_rewrites, 1);
+		_HA_ATOMIC_INC(&sess->fe->fe_counters.failed_rewrites);
 		if (s->flags & SF_BE_ASSIGNED)
-			_HA_ATOMIC_ADD(&s->be->be_counters.failed_rewrites, 1);
+			_HA_ATOMIC_INC(&s->be->be_counters.failed_rewrites);
 		if (sess->listener && sess->listener->counters)
-			_HA_ATOMIC_ADD(&sess->listener->counters->failed_rewrites, 1);
+			_HA_ATOMIC_INC(&sess->listener->counters->failed_rewrites);
 		if (objt_server(s->target))
-			_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.failed_rewrites, 1);
+			_HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_rewrites);
 
 		if (!(s->txn->req.flags & HTTP_MSGF_SOFT_RW)) {
 			if (!(s->flags & SF_ERR_MASK))
@@ -403,10 +403,10 @@
 	s->req.analysers &= AN_REQ_FLT_END;
 	s->res.analysers &= AN_RES_FLT_END;
 
-	_HA_ATOMIC_ADD(&s->be->be_counters.denied_req, 1);
-	_HA_ATOMIC_ADD(&sess->fe->fe_counters.denied_req, 1);
+	_HA_ATOMIC_INC(&s->be->be_counters.denied_req);
+	_HA_ATOMIC_INC(&sess->fe->fe_counters.denied_req);
 	if (sess->listener && sess->listener->counters)
-		_HA_ATOMIC_ADD(&sess->listener->counters->denied_req, 1);
+		_HA_ATOMIC_INC(&sess->listener->counters->denied_req);
 
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_PRXCOND;
@@ -964,7 +964,7 @@
 	req->analysers &= AN_REQ_FLT_END;
 
 	if (s->sess->fe == s->be) /* report it if the request was intercepted by the frontend */
-		_HA_ATOMIC_ADD(&s->sess->fe->fe_counters.intercepted_req, 1);
+		_HA_ATOMIC_INC(&s->sess->fe->fe_counters.intercepted_req);
 
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_LOCAL;
@@ -1253,13 +1253,13 @@
 	goto leave;
 
   fail_rewrite:
-	_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_rewrites, 1);
+	_HA_ATOMIC_INC(&sess->fe->fe_counters.failed_rewrites);
 	if (s->flags & SF_BE_ASSIGNED)
-		_HA_ATOMIC_ADD(&s->be->be_counters.failed_rewrites, 1);
+		_HA_ATOMIC_INC(&s->be->be_counters.failed_rewrites);
 	if (sess->listener && sess->listener->counters)
-		_HA_ATOMIC_ADD(&sess->listener->counters->failed_rewrites, 1);
+		_HA_ATOMIC_INC(&sess->listener->counters->failed_rewrites);
 	if (objt_server(s->target))
-		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.failed_rewrites, 1);
+		_HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_rewrites);
 
 	if (!(msg->flags & HTTP_MSGF_SOFT_RW)) {
 		ret = ACT_RET_ERR;
@@ -1366,13 +1366,13 @@
 	goto leave;
 
   fail_rewrite:
-	_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_rewrites, 1);
+	_HA_ATOMIC_INC(&sess->fe->fe_counters.failed_rewrites);
 	if (s->flags & SF_BE_ASSIGNED)
-		_HA_ATOMIC_ADD(&s->be->be_counters.failed_rewrites, 1);
+		_HA_ATOMIC_INC(&s->be->be_counters.failed_rewrites);
 	if (sess->listener && sess->listener->counters)
-		_HA_ATOMIC_ADD(&sess->listener->counters->failed_rewrites, 1);
+		_HA_ATOMIC_INC(&sess->listener->counters->failed_rewrites);
 	if (objt_server(s->target))
-		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.failed_rewrites, 1);
+		_HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_rewrites);
 
 	if (!(msg->flags & HTTP_MSGF_SOFT_RW)) {
 		ret = ACT_RET_ERR;
@@ -2040,7 +2040,7 @@
 		req->analysers &= AN_REQ_FLT_END;
 
 		if (s->sess->fe == s->be) /* report it if the request was intercepted by the frontend */
-			_HA_ATOMIC_ADD(&s->sess->fe->fe_counters.intercepted_req, 1);
+			_HA_ATOMIC_INC(&s->sess->fe->fe_counters.intercepted_req);
 	}
 
 	if (!(s->flags & SF_ERR_MASK))