fix r3078: do not increase request counter if body has been just discarded

src/http/ngx_http_request_body.c

diff --git a/src/http/ngx_http_request_body.c b/src/http/ngx_http_request_body.c
index dc593f1..bc2a14e 100644
--- a/src/http/ngx_http_request_body.c
+++ b/src/http/ngx_http_request_body.c
@@ -477,8 +477,9 @@
         return NGX_HTTP_INTERNAL_SERVER_ERROR;
     }
 
-    r->count++;
-    (void) ngx_http_read_discarded_request_body(r);
+    if (ngx_http_read_discarded_request_body(r) != NGX_OK) {
+        r->count++;
+    }
 
     return NGX_OK;
 }