utils: checkstyle: Add __repr__ method to CommitFile class

Add a custom representation to the CommitFile class in order to
facilitate debugging.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

utils/checkstyle.py

@@ -191,6 +191,9 @@ class CommitFile:
         else:
             self.__filename = info[1]
 
+    def __repr__(self):
+        return f'{self.__status} {self.__filename}'
+
     @property
     def filename(self):
         return self.__filename