login: fix buglet introduced by "simplification"

diff --git a/loginutils/login.c b/loginutils/login.c
index cdc38fb..85bb737 100644
--- a/loginutils/login.c
+++ b/loginutils/login.c
@@ -180,7 +180,7 @@
 	if (getfilecon(full_tty, &old_tty_sid) < 0) {
 		bb_perror_msg_and_die("getfilecon(%s) failed", full_tty);
 	}
-	if (security_compute_relabel(user_sid, old_tty_sid,
+	if (security_compute_relabel(*user_sid, old_tty_sid,
 				SECCLASS_CHR_FILE, &new_tty_sid) != 0) {
 		bb_perror_msg_and_die("security_change_sid(%s) failed", full_tty);
 	}