[PATCH 5 of 5 V2] revert: drop now useless conditional in the backup check

[Pierre-Yves David]

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at fb.com>
# Date 1409356262 -7200
#      Sat Aug 30 01:51:02 2014 +0200
# Node ID 5417bc06f6b3f7f9ab18c998dc08541ee825afaf
# Parent  f2199b928fd12e6b82387e7563e683e935df455c
revert: drop now useless conditional in the backup check

Now that we removed the (hopeless attempt) attempt to backup file we knew to be
missing in the target changesets, we can stop checking if the file exists in
the target changeset.

diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -2549,12 +2549,12 @@ def revert(ui, repo, ctx, parents, *pats
             for table, (xlist, msg), dobackup in disptable:
                 if abs not in table:
                     continue
                 if xlist is not None:
                     xlist.append(abs)
-                    if (dobackup and os.path.lexists(target) and
-                        abs in ctx and repo[None][abs].cmp(ctx[abs])):
+                    if (dobackup and os.path.lexists(target)
+                        and repo[None][abs].cmp(ctx[abs])):
                         bakname = "%s.orig" % rel
                         ui.note(_('saving current version of %s as %s\n') %
                                 (rel, bakname))
                         if not opts.get('dry_run'):
                             util.rename(target, bakname)