ASoC: sta32x: Remove unneeded gpiod NULL check

The gpiod API checks for NULL descriptors, so there is no need to
duplicate the check in the driver.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/sta32x.c

@@ -847,7 +847,6 @@ static int sta32x_set_bias_level(struct snd_soc_codec *codec,
 		msleep(300);
 		sta32x_watchdog_stop(sta32x);
 
-		if (sta32x->gpiod_nreset)
 		gpiod_set_value(sta32x->gpiod_nreset, 0);
 
 		regulator_bulk_disable(ARRAY_SIZE(sta32x->supplies),