mlog.shutdown(): Return the log file path or None if not initialized

mesonbuild/mlog.py

@@ -59,9 +59,12 @@ def set_timestamp_start(start):
 def shutdown():
     global log_file
     if log_file is not None:
+        path = log_file.name
         exception_around_goer = log_file
         log_file = None
         exception_around_goer.close()
+        return path
+    return None
 
 class AnsiDecorator:
     plain_code = "\033[0m"