Fix style (long line)

dulwich/porcelain.py

@@ -327,7 +327,8 @@ def clone(source, target=None, bare=False, checkout=None,
     reflog_message = b'clone: from ' + source.encode('utf-8')
     try:
         fetch_result = fetch(
-            r, source, origin, errstream=errstream, message=reflog_message, **kwargs)
+            r, source, origin, errstream=errstream, message=reflog_message,
+            **kwargs)
         target_config = r.get_config()
         if not isinstance(source, bytes):
             source = source.encode(DEFAULT_ENCODING)