leds: aw2013: Unlock mutex before destroying it

[ Upstream commit 6969d0a2 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>