ASoC: cs42l52: use true/false returns for bool functions

Return true or false instead of 1 and 0
Signed-off-by: Brian Austin <brian.austin@cirrus.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/codecs/cs42l52.c

@@ -176,9 +176,9 @@ static bool cs42l52_volatile_register(struct device *dev, unsigned int reg)
 	case CS42L52_BATT_LEVEL:
 	case CS42L52_SPK_STATUS:
 	case CS42L52_CHARGE_PUMP:
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }