stash: convert branch to builtin

diff --git a/builtin/tag.c b/builtin/tag.c
index 6a396a5090f1e6cf0ed73f001a6bef006789b26f..02f6bd1279d9c360f97d04ebba0b1f88ff2f27e1 100644 (file)
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -338,6 +338,8 @@ static int parse_msg_arg(const struct option *opt, const char *arg, int unset)
 {
        struct msg_arg *msg = opt->value;
 
+       BUG_ON_OPT_NEG(unset);
+
        if (!arg)
                return -1;
        if (msg->buf.len)