some modification about directory feature

include/spdlog/details/file_helper.h

@@ -53,10 +53,10 @@ public:
         {
             if (os::dir_check(fname, dirs)) 
                 if(os::create_dirs(dirs))
-                    return;
+                    break;
 
-            if (!os::fopen_s(&_fd, fname, mode))
+            if(!os::fopen_s(&_fd, fname, mode))
-                return ;
+                return;
 
             std::this_thread::sleep_for(std::chrono::milliseconds(open_interval));
         }