ASoC: max9850: use true and false for boolean values

Return statements in functions returning bool should use true or false
instead of an integer value.

This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/max9850.c

@@ -52,9 +52,9 @@ static bool max9850_volatile_register(struct device *dev, unsigned int reg)
 	switch (reg) {
 	case MAX9850_STATUSA:
 	case MAX9850_STATUSB:
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }