ASoC: adau1977: 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/adau1977.c

@@ -388,8 +388,7 @@ static int adau1977_power_disable(struct adau1977 *adau1977)
 
 	regcache_mark_dirty(adau1977->regmap);
 
-	if (adau1977->reset_gpio)
-		gpiod_set_value_cansleep(adau1977->reset_gpio, 0);
+	gpiod_set_value_cansleep(adau1977->reset_gpio, 0);
 
 	regcache_cache_only(adau1977->regmap, true);
 
@@ -420,8 +419,7 @@ static int adau1977_power_enable(struct adau1977 *adau1977)
 			goto err_disable_avdd;
 	}
 
-	if (adau1977->reset_gpio)
-		gpiod_set_value_cansleep(adau1977->reset_gpio, 1);
+	gpiod_set_value_cansleep(adau1977->reset_gpio, 1);
 
 	regcache_cache_only(adau1977->regmap, false);