Bugfixes in imap client code

* libproto/imap/mbox.c (_imap_message_unseen): Fix type of
pointer returned by mu_list_head
* libproto/imap/resproc.c (parse_response_code): Fix parser

@@ -875,10 +875,10 @@ _imap_message_unseen (mu_mailbox_t mbox, size_t *pn)
       rc = mu_msgset_get_list (msgset, &list);
       if (rc == 0)
 	{
-	  struct mu_msgrange r;
+	  struct mu_msgrange *r;
 	  rc = mu_list_head (list, (void **) &r);
 	  if (rc == 0)
-	    *pn = r.msg_beg;
+	    *pn = r->msg_beg;
 	}
       mu_msgset_free (msgset);
       return rc;

@@ -72,7 +72,7 @@ parse_response_code (mu_imap_t imap, mu_list_t resp)
       if (mu_kwd_xlat_name (mu_imap_response_codes, arg->v.string, &rcode))
 	return -1;
       
-      arg = _mu_imap_list_at (resp, 3);
+      arg = _mu_imap_list_at (resp, 4);
       if (!arg || !_mu_imap_list_element_is_string (arg, "]"))
 	return -1;
     }