ASoC: cs42l56: 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/cs42l56.c

@@ -171,9 +171,9 @@ static bool cs42l56_volatile_register(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case CS42L56_INT_STATUS:
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }