ASoC: twl6040: 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/twl6040.c

@@ -148,7 +148,7 @@ static bool twl6040_can_write_to_chip(struct snd_soc_component *component,
 	case TWL6040_REG_HFRCTL:
 		return priv->dl2_unmuted;
 	default:
-		return 1;
+		return true;
 	}
 }