CLEANUP: http_ana: Remove now unused label from http_process_request()

Since last change on HTTP analysers (252412316 "MEDIUM: proxy: remove
long-broken 'option http_proxy'"), http_process_request() may only return
internal errors on failures. Thus the label used to handle bad requests may
be removed.

This patch should fix the issue #1330.
diff --git a/src/http_ana.c b/src/http_ana.c
index 884ad50..b360540 100644
--- a/src/http_ana.c
+++ b/src/http_ana.c
@@ -801,16 +801,7 @@
 		_HA_ATOMIC_INC(&s->be->be_counters.internal_errors);
 	if (sess->listener && sess->listener->counters)
 		_HA_ATOMIC_INC(&sess->listener->counters->internal_errors);
-	goto return_prx_cond;
-
- return_bad_req: /* let's centralize all bad requests */
-	txn->status = 400;
-	_HA_ATOMIC_INC(&sess->fe->fe_counters.failed_req);
-	if (sess->listener && sess->listener->counters)
-		_HA_ATOMIC_INC(&sess->listener->counters->failed_req);
-	/* fall through */
 
- return_prx_cond:
 	http_reply_and_close(s, txn->status, http_error_message(s));
 
 	if (!(s->flags & SF_ERR_MASK))