Return the diff dict instead of the dictdiffer object

Author: terminalmage

salt/states/file.py

@@ -7311,7 +7311,7 @@ def serialize(name,
 
     if isinstance(existing_data, dict) and isinstance(merged_data, dict):
         ret['changes']['diff'] = salt.utils.dictdiffer.recursive_diff(
-            existing_data, merged_data)
+            existing_data, merged_data).diffs
 
     return ret