walkchangerevs: simplify with an 'elif'
Since 'match.files()' is interchangeable with 'not match.files()', we
can simplify with an 'elif' follwoing the 'if match.always()'.
--- a/mercurial/cmdutil.py Tue May 26 07:44:37 2015 -0500
+++ b/mercurial/cmdutil.py Thu May 21 14:20:24 2015 -0700
@@ -1767,8 +1767,7 @@
if match.always():
# No files, no patterns. Display all revs.
wanted = revs
-
- if not slowpath and match.files():
+ elif not slowpath:
# We only have to read through the filelog to find wanted revisions
try: