ASoC: tlv320aic3x: Use empty struct initializer

{ 0 } only clears the first member of the structure.

The first member of the snd_soc_dapm_update struct is a pointer,
and writing 0 to a pointer results in the following sparse warning:

sound/soc/codecs/tlv320aic3x.c:175:47: warning: Using plain integer as NULL pointer

Use the empty struct initializer that clears all the struct members
and fixes the sparse warning.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tlv320aic3x.c

@@ -172,7 +172,7 @@ static int snd_soc_dapm_put_volsw_aic3x(struct snd_kcontrol *kcontrol,
 	unsigned int mask = (1 << fls(max)) - 1;
 	unsigned int invert = mc->invert;
 	unsigned short val;
-	struct snd_soc_dapm_update update = { 0 };
+	struct snd_soc_dapm_update update = {};
 	int connect, change;
 
 	val = (ucontrol->value.integer.value[0] & mask);