[PATCH 1 of 3] filelog: remove unused variable 'lkr'

[Martin von Zweigbergk]

# HG changeset patch
# User Martin von Zweigbergk <martinvonz at google.com>
# Date 1421084885 28800
#      Mon Jan 12 09:48:05 2015 -0800
# Node ID 2628aedc614c41d9c2a5a3cac485df34dc3fde78
# Parent  678f53865c6860a950392691814766957ee89316
filelog: remove unused variable 'lkr'

It's used further down, but it's overwritten before, so it's
technically a dead assignment, but unnecessary nevertheless.

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -805,7 +805,7 @@
         lowesthead = None # cache for manifest content of all head revisions
         fl = repo.file(f)
         for fr in list(fl):
-            lkr = rev = fl.linkrev(fr)
+            rev = fl.linkrev(fr)
             if rev not in cl:
                 # changerev pointed in linkrev is filtered
                 # record it for post processing.