[PATCH 1 of 2] largefiles: tiny code clean up

[michalsznajder at gmail.com]

# HG changeset patch
# User Michal Sznajder <michalsznajder at gmail.com>
# Date 1325026580 -3600
# Node ID bf75d457784e6dff76117a1868ba05cc5b7205e8
# Parent  5b384b7f48d5c4d4b043f5cf7ca78f3f2869846e
largefiles: tiny code clean up

lfutil.islfilesrepo is a preffered way for testing if repo is largefiles enabled

diff --git a/hgext/largefiles/overrides.py b/hgext/largefiles/overrides.py
--- a/hgext/largefiles/overrides.py
+++ b/hgext/largefiles/overrides.py
@@ -63,7 +63,7 @@
         ui, lfutil.islfilesrepo(repo), opts.pop('lfsize', None))
 
     lfmatcher = None
-    if os.path.exists(repo.wjoin(lfutil.shortname)):
+    if lfutil.islfilesrepo(repo):
         lfpats = ui.configlist(lfutil.longname, 'patterns', default=[])
         if lfpats:
             lfmatcher = match_.match(repo.root, '', list(lfpats))