in_systemd: fix pointer error
@@ -51,7 +51,7 @@ static int tag_compose(char *tag, char *unit_name,
/* 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));
