BUG/MINOR: http/counters: fix missing increment of fe->srv_aborts

When a server aborts a transfer, we used to increment the backend's
counter but not the frontend's during the forwarding phase. This fixes
it. It might be backported to all supported versions (possibly removing
the htx part) though it is of very low importance.
diff --git a/src/proto_http.c b/src/proto_http.c
index 4190313..4c9e609 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -5295,6 +5295,7 @@
 		if (!ci_data(res)) {
 			if (!(s->flags & SF_ERR_MASK))
 				s->flags |= SF_ERR_SRVCL;
+			_HA_ATOMIC_ADD(&sess->fe->fe_counters.srv_aborts, 1);
 			_HA_ATOMIC_ADD(&s->be->be_counters.srv_aborts, 1);
 			if (objt_server(s->target))
 				_HA_ATOMIC_ADD(&objt_server(s->target)->counters.srv_aborts, 1);
diff --git a/src/proto_htx.c b/src/proto_htx.c
index a65297d..f9e35e5 100644
--- a/src/proto_htx.c
+++ b/src/proto_htx.c
@@ -2261,6 +2261,7 @@
 		if (htx_is_empty(htx)) {
 			if (!(s->flags & SF_ERR_MASK))
 				s->flags |= SF_ERR_SRVCL;
+			_HA_ATOMIC_ADD(&sess->fe->fe_counters.srv_aborts, 1);
 			_HA_ATOMIC_ADD(&s->be->be_counters.srv_aborts, 1);
 			if (objt_server(s->target))
 				_HA_ATOMIC_ADD(&objt_server(s->target)->counters.srv_aborts, 1);