Merge pull request #2363 from SpamExperts/unbound_local_var_fix

Ensure that the `err_code` variable is initialized before using.

PIL/ImageFile.py

@@ -186,7 +186,7 @@ def load(self):
                     self.map = None
 
         self.load_prepare()
-
+        err_code = -3 # initialize to unknown error
         if not self.map:
             # sort tiles in file order
             self.tile.sort(key=_tilesort)