net: Fix links collection retcode

There's a

   if (bad_thing) {
	   ret = -1;
	   break;
   }

code above this hunk, whose intention is to propagate -1 back to
caller. This propagation is obviously broken.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/net.c

@@ -1560,7 +1560,7 @@ static int read_links(struct ns_id *ns)
 	}
 	close_image(img);
 
-	return 0;
+	return ret;
 }
 
 static int restore_link(int nlsk, struct ns_id *ns, struct net_link *link)