Limit req: fixed "nodelay" parsing.

Previously arguments starting with "nodelay" were considered valid,
e.g. "limit_req ... nodelayFOO;".

src/http/modules/ngx_http_limit_req_module.c

diff --git a/src/http/modules/ngx_http_limit_req_module.c b/src/http/modules/ngx_http_limit_req_module.c
index 90434c9..d4c1ff6 100644
--- a/src/http/modules/ngx_http_limit_req_module.c
+++ b/src/http/modules/ngx_http_limit_req_module.c
@@ -912,7 +912,7 @@
             continue;
         }
 
-        if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) {
+        if (ngx_strcmp(value[i].data, "nodelay") == 0) {
             nodelay = 1;
             continue;
         }