store: sort filenames in place

mercurial/store.py

@@ -264,7 +264,8 b' class basicstore(object):'
                         l.append((decodedir(n), n, st.st_size))
                     elif kind == stat.S_IFDIR and recurse:
                         visit.append(fp)
-        return sorted(l)
+        l.sort()
+        return l
 
     def datafiles(self):
         return self._walk('data', True)