Request body: fixed r->count increment on allocation failure.

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 2c61231..7ca3287 100644
--- a/src/http/ngx_http_request_body.c
+++ b/src/http/ngx_http_request_body.c
@@ -152,7 +152,8 @@
 
             cl = ngx_chain_get_free_buf(r->pool, &rb->free);
             if (cl == NULL) {
-                return NGX_HTTP_INTERNAL_SERVER_ERROR;
+                rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
+                goto done;
             }
 
             b = cl->buf;