selftests/seccomp: Stop USER_NOTIF test if kcmp() fails

If kcmp() fails during the USER_NOTIF test, the test is likely to hang,
so switch from EXPECT to ASSERT.

Cc: Andy Lutomirski <[email protected]>
Cc: Will Drewry <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Acked-by: "Eric W. Biederman" <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: kees

tools/testing/selftests/seccomp/seccomp_bpf.c

@@ -4087,7 +4087,7 @@ TEST(user_notification_addfd)
 	 * lowest available fd to be assigned here.
 	 */
 	EXPECT_EQ(fd, nextfd++);
-	EXPECT_EQ(filecmp(getpid(), pid, memfd, fd), 0);
+	ASSERT_EQ(filecmp(getpid(), pid, memfd, fd), 0);
 
 	/*
 	 * This sets the ID of the ADD FD to the last request plus 1. The