Upstream: fix tries check in ip_hash.

Make two checks for maximum number of tries consistent.
The other one checks '>' condition.

src/http/modules/ngx_http_upstream_ip_hash_module.c

diff --git a/src/http/modules/ngx_http_upstream_ip_hash_module.c b/src/http/modules/ngx_http_upstream_ip_hash_module.c
index 041883f..148d73a 100644
--- a/src/http/modules/ngx_http_upstream_ip_hash_module.c
+++ b/src/http/modules/ngx_http_upstream_ip_hash_module.c
@@ -231,7 +231,7 @@
 
     next:
 
-        if (++iphp->tries >= 20) {
+        if (++iphp->tries > 20) {
             return iphp->get_rr_peer(pc, &iphp->rrp);
         }
     }