power: reset: ltc2952: use _optional variant of devm_gpiod_get
devm_gpiod_get_optional returns NULL if devm_gpiod_get would return an ENOENT error pointer. There is no semantic change intended. Signed-off-by:Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by:
Sebastian Reichel <sre@kernel.org>
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