[nginx] Win32: fixed build with MinGW and MinGW-w64 gcc.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/954b67727af3
branches:  
changeset: 6265:954b67727af3
user:      Kouhei Sutou <kou at cozmixng.org>
date:      Sat Oct 17 21:41:02 2015 +0900
description:
Win32: fixed build with MinGW and MinGW-w64 gcc.

This change fixes the "comparison between signed and unsigned integer
expressions" warning, introduced in 5e6142609e48 (1.9.4).

diffstat:

 src/core/ngx_connection.c |  2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diffs (12 lines):

diff --git a/src/core/ngx_connection.c b/src/core/ngx_connection.c
--- a/src/core/ngx_connection.c
+++ b/src/core/ngx_connection.c
@@ -1175,7 +1175,7 @@ ngx_close_idle_connections(ngx_cycle_t *
 
         /* THREAD: lock */
 
-        if (c[i].fd != -1 && c[i].idle) {
+        if (c[i].fd != (ngx_socket_t) -1 && c[i].idle) {
             c[i].close = 1;
             c[i].read->handler(c[i].read);
         }