Only used stripped data for testing if the file is json, but used unstripped…

Only used stripped data for testing if the file is json, but used unstripped when actually parsing. Fixes #6348

lib/ansible/utils/__init__.py

@@ -354,9 +354,9 @@ def smush_ds(data):
 def parse_yaml(data, path_hint=None):
     ''' convert a yaml string to a data structure.  Also supports JSON, ssssssh!!!'''
 
-    data = data.lstrip()
+    stripped_data = data.lstrip()
     loaded = None
-    if data.startswith("{") or data.startswith("["):
+    if stripped_data.startswith("{") or stripped_data.startswith("["):
         # since the line starts with { or [ we can infer this is a JSON document.
         try:
             loaded = json.loads(data)