largefiles: don't access repo.changelog directly in getlfilestoupload

Make it possible to pass both nodes and revisions to getlfilestoupload.

hgext/largefiles/lfutil.py

@@ -486,7 +486,7 b' def getlfilestoupload(repo, missing, add'
     for i, n in enumerate(missing):
         repo.ui.progress(_('finding outgoing largefiles'), i,
             unit=_('revisions'), total=len(missing))
-        parents = [p for p in repo.changelog.parents(n) if p != node.nullid]
+        parents = [p for p in repo[n].parents() if p != node.nullid]
 
         oldlfstatus = repo.lfstatus
         repo.lfstatus = False