ASoC: cs42l42: Only report button state if there was a button interrupt

Only report a button state change if the interrupt status shows that
there was a button event.

Previously the code would always drop into the button reporting at the
end of interrupt handling if the jack was present. If neither of the
button report interrupts were pending it would report all buttons
released. This could then lead to a button being reported as released
while it is still pressed.

Fixes: c5b8ee0879bc ("ASoC: cs42l42: Report jack and button detection")
Signed-off-by: Richard Fitzgerald <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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