in_tail: fix pointer error
@@ -330,7 +330,7 @@ static int tag_compose(char *tag, char *fname, char **out_buf, size_t *out_size)
/* Tag suffix (if any) */
p++;
- if (p) {
+ if (*p) {
len = strlen(tag);
memcpy(buf + buf_s, p, (len - (p - tag)));
buf_s += (len - (p - tag));
