leds: aw2013: Unlock mutex before destroying it

In the probe() callback in case of error mutex is destroyed being locked
which is not allowed so unlock the mutex before destroying.

Fixes: 59ea3c9f ("leds: add aw2013 driver")
Signed-off-by: George Stark <gnstark@salutedevices.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20231214173614.2820929-2-gnstark@salutedevices.com


Signed-off-by: Lee Jones <lee@kernel.org>