ASoC: sma1307: Fix uevent string leaks in fault worker

ASoC: sma1307: Fix uevent string leaks in fault worker

sma1307_check_fault_worker() stores dynamically allocated uevent strings in
envp[0]. Several fault conditions are checked in sequence, so a later fault
can overwrite envp[0] before the final kfree() and leak the previous
allocation.

The same flow can leave an OT1 volume entry in envp[1] while envp[0]
has been overwritten by a later non-OT1 fault, causing an inconsistent
uevent payload.

Use static STATUS strings and a stack buffer for the optional VOLUME entry.
This removes the allocations from the worker and keeps VOLUME tied only
to the OT1 events that produce it.

Fixes: 576c57e6b4c1 ("ASoC: sma1307: Add driver for Iron Device SMA1307")
Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
Link: https://patch.msgid.link/20260609-asoc-sma1307-uevent-leak-v1-1-cd7f5b062ab7@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>