selftests/futex: futex_waitv wouldblock test should fail

Testcase should fail if -EWOULDBLOCK is not returned when expected value
differs from actual value from the waiter.

Link: https://lore.kernel.org/r/20250404221225.1596324-1-edliaw@google.com
Fixes: 9d57f7c ("selftests: futex: Test sys_futex_waitv() wouldblock")
Signed-off-by: Edward Liaw <edliaw@google.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: André Almeida <andrealmeid@igalia.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/futex/functional/futex_wait_wouldblock.c

@@ -98,7 +98,7 @@ int main(int argc, char *argv[])
 	info("Calling futex_waitv on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);
 	res = futex_waitv(&waitv, 1, 0, &to, CLOCK_MONOTONIC);
 	if (!res || errno != EWOULDBLOCK) {
-		ksft_test_result_pass("futex_waitv returned: %d %s\n",
+		ksft_test_result_fail("futex_waitv returned: %d %s\n",
 				      res ? errno : res,
 				      res ? strerror(errno) : "");
 		ret = RET_FAIL;