iio: adc: meson_saradc: Better handle BL30 not releasing the hardware

meson_sar_adc_lock() might return an error if BL30 doesn't release its
lock on the hardware. Just returning early from .remove() is wrong
however as this keeps the clocks and regulators on which is never
cleaned up later.

Given the BL30 not giving up its lock is a strong hint for broken
behaviour, and there is nothing we can do about that: Just clean up
ignoring the fact that we're not holding the lock.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20230219204439.1641640-1-u.kleine-koenig@pengutronix.de


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>