fix request counter for memcached, introduced in r3050

src/http/modules/ngx_http_memcached_module.c

diff --git a/src/http/modules/ngx_http_memcached_module.c b/src/http/modules/ngx_http_memcached_module.c
index dc7c767..6cf5881 100644
--- a/src/http/modules/ngx_http_memcached_module.c
+++ b/src/http/modules/ngx_http_memcached_module.c
@@ -211,6 +211,8 @@
     u->input_filter = ngx_http_memcached_filter;
     u->input_filter_ctx = ctx;
 
+    r->main->count++;
+
     ngx_http_upstream_init(r);
 
     return NGX_DONE;