sshrepo: fix bug in error formatting.

mercurial/sshrepo.py

@@ -144,7 +144,7 b' class sshrepository(remoterepository):'
     def addchangegroup(self, cg, source):
         d = self.call("addchangegroup")
         if d:
-            raise hg.RepoError(_("push refused: %s"), d)
+            raise hg.RepoError(_("push refused: %s") % d)
 
         while 1:
             d = cg.read(4096)