Fix names of the referer hash size directives introduced in r3940.

src/http/modules/ngx_http_referer_module.c

diff --git a/src/http/modules/ngx_http_referer_module.c b/src/http/modules/ngx_http_referer_module.c
index 252fb5a..cf2d744 100644
--- a/src/http/modules/ngx_http_referer_module.c
+++ b/src/http/modules/ngx_http_referer_module.c
@@ -309,7 +309,7 @@
     hash.key = ngx_hash_key_lc;
     hash.max_size = conf->referer_hash_max_size;
     hash.bucket_size = conf->referer_hash_bucket_size;
-    hash.name = "referers_hash";
+    hash.name = "referer_hash";
     hash.pool = cf->pool;
 
     if (conf->keys->keys.nelts) {