[PATCH 1 of 4] Fix of separate pool for upstream connectins

[Maxim Dounin]

# HG changeset patch
# User Maxim Dounin <mdounin at mdounin.ru>
# Date 1316368092 -14400
# Node ID 187de3097048531a3bd3d7a84a40657d1f0df216
# Parent  61039cdc036dce3956ef8fe91852bab795492222
Fix of separate pool for upstream connectins.

Pool may not be created if connection was created but rejected in connect()
call.  Make sure to check if it is here before trying to destroy it.

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -2922,7 +2922,10 @@ ngx_http_upstream_next(ngx_http_request_
         }
 #endif
 
-        ngx_destroy_pool(u->peer.connection->pool);
+        if (u->peer.connection->pool) {
+            ngx_destroy_pool(u->peer.connection->pool);
+        }
+
         ngx_close_connection(u->peer.connection);
     }
 
@@ -3017,7 +3020,10 @@ ngx_http_upstream_finalize_request(ngx_h
                        "close http upstream connection: %d",
                        u->peer.connection->fd);
 
-        ngx_destroy_pool(u->peer.connection->pool);
+        if (u->peer.connection->pool) {
+            ngx_destroy_pool(u->peer.connection->pool);
+        }
+
         ngx_close_connection(u->peer.connection);
     }