ASoC: nau8825: drop redundant idiom when converting integer to boolean

Thanks Mark and Anatol for the discussion. According to the result,
the standard C will translate any non-zero value into true, or
false otherwise.
QUOTE:
"6.3.1.2 Boolean type
When any scalar value is converted to _Bool, the result is 0 if the
value compares equal to 0; otherwise, the result is 1
"
Thus, the "!!" idiom is removed.
Signed-off-by: John Hsu <KCHSU0@nuvoton.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/nau8825.c

@@ -1349,9 +1349,9 @@ static bool nau8825_is_jack_inserted(struct regmap *regmap)
 	int status, jkdet;
 
 	regmap_read(regmap, NAU8825_REG_JACK_DET_CTRL, &jkdet);
-	active_high = !!(jkdet & NAU8825_JACK_POLARITY);
+	active_high = jkdet & NAU8825_JACK_POLARITY;
 	regmap_read(regmap, NAU8825_REG_I2C_DEVICE_ID, &status);
-	is_high = !!(status & NAU8825_GPIO2JD1);
+	is_high = status & NAU8825_GPIO2JD1;
 	/* return jack connection status according to jack insertion logic
 	 * active high or active low.
 	 */