Replaced 'not foo == None' with 'foo is not None' in ascii sniffing too

mediagoblin/media_types/ascii/processing.py

@@ -27,7 +27,7 @@ _log = logging.getLogger(__name__)
 SUPPORTED_EXTENSIONS = ['txt', 'asc', 'nfo']
 
 def sniff_handler(media_file, **kw):
-    if not kw.get('media') == None:
+    if kw.get('media') is not None:
         name, ext = os.path.splitext(kw['media'].filename)
         clean_ext = ext[1:].lower()