ASoC: cx2072x: remove set but not used variable 'is_right_j '

Fixes gcc '-Wunused-but-set-variable' warning:

sound/soc/codecs/cx2072x.c: In function cx2072x_config_i2spcm:
sound/soc/codecs/cx2072x.c:679:6: warning: variable is_right_j set but not used [-Wunused-but-set-variable]

It's never used and can be removed.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cx2072x.c

@@ -676,7 +676,6 @@ static int cx2072x_config_i2spcm(struct cx2072x_priv *cx2072x)
 	unsigned int bclk_rate = 0;
 	int is_i2s = 0;
 	int has_one_bit_delay = 0;
-	int is_right_j = 0;
 	int is_frame_inv = 0;
 	int is_bclk_inv = 0;
 	int pulse_len;
@@ -740,7 +739,6 @@ static int cx2072x_config_i2spcm(struct cx2072x_priv *cx2072x)
 
 	case SND_SOC_DAIFMT_RIGHT_J:
 		is_i2s = 1;
-		is_right_j = 1;
 		pulse_len = frame_len / 2;
 		break;