selftests/alsa: Do not take another control's event as our own

The wait_for_event() skips an event for a different control with a
continue inside its do-while loop. But continue goes straight to the
loop condition, and that tests the mask of the event just skipped. So
a value event for another control ends the wait as if it were ours.

A driver that notifies a second control from its put() queues that
event first. The core only sends ours once put() returns. So the wait
returns early and leaves ours in the queue. The next test then
reports it as spurious. And event_missing passes for a control whose
put() said nothing changed, as long as it notified a neighbour.

To fix this, clear the mask before skipping the event.

Fixes: b1446bda5645 ("kselftest: alsa: Check for event generation when we write to controls")
Signed-off-by: HyeongJun An <sammiee5311@gmail.com>
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20260930111534.3782264-2-sammiee5311@gmail.com

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