ASoC: wm8996: 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>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wm8996.c

@@ -1498,9 +1498,9 @@ static bool wm8996_readable_register(struct device *dev, unsigned int reg)
 	case WM8996_RIGHT_PDM_SPEAKER:
 	case WM8996_PDM_SPEAKER_MUTE_SEQUENCE:
 	case WM8996_PDM_SPEAKER_VOLUME:
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }
 
@@ -1522,9 +1522,9 @@ static bool wm8996_volatile_register(struct device *dev, unsigned int reg)
 	case WM8996_MIC_DETECT_3:
 	case WM8996_HEADPHONE_DETECT_1:
 	case WM8996_HEADPHONE_DETECT_2:
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }