use ngx_int_t in ngx_sort() callback
diff --git a/src/http/ngx_http_upstream_round_robin.c b/src/http/ngx_http_upstream_round_robin.c
index c25c076..0621371 100644
--- a/src/http/ngx_http_upstream_round_robin.c
+++ b/src/http/ngx_http_upstream_round_robin.c
@@ -9,7 +9,8 @@
 #include <ngx_http.h>
 
 
-static int ngx_http_upstream_cmp_servers(const void *one, const void *two);
+static ngx_int_t ngx_http_upstream_cmp_servers(const void *one,
+    const void *two);
 static ngx_uint_t
 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers);
 
@@ -185,7 +186,7 @@
 }
 
 
-static int
+static ngx_int_t
 ngx_http_upstream_cmp_servers(const void *one, const void *two)
 {
     ngx_http_upstream_rr_peer_t  *first, *second;