selftests: ALSA: Remove unused variable in utimer-test

The variable 'i' in wrong_timers_test() is declared but never used.
This was detected by Cppcheck static analysis.

tools/testing/selftests/alsa/utimer-test.c:144:9: style: Unused variable: i [unusedVariable]

Remove it to clean up the code and silence the warning.

Signed-off-by: LeeYongjun <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

tools/testing/selftests/alsa/utimer-test.c

···
 TEST(wrong_timers_test) {
 	int timer_dev_fd;
 	int utimer_fd;
-	size_t i;
 	struct snd_timer_uinfo wrong_timer = {
 		.resolution = 0,
 		.id = UTIMER_DEFAULT_ID,