style: fix style hook when run from a repo subdir.

Before this fix, the style hook would blow up when you did a qrefresh to add
a new file, but executed the qrefresh from a repository sub directory.

--HG--
extra : convert_revision : 851b0421dfa5c5b23d0f49441c4ba2e0ac579c5d

util/style.py

@@ -286,7 +286,7 @@ def check_whitespace(ui, repo, hooktype, node, parent1, parent2):
 
     for fname in added:
         ok = True
-        for line,num in checkwhite(fname):
+        for line,num in checkwhite(repo.wjoin(fname)):
             ui.write("invalid whitespace in %s:%d\n" % (fname, num))
             if verbose:
                 ui.write(">>%s<<\n" % line[-1])