ASoC: sn95031: Do not use static variable for channel_index

No reason to use static variable for channel_index.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/sn95031.c

@@ -102,7 +102,7 @@ static int sn95031_initialize_adc(struct snd_soc_codec *sn95031_codec)
 {
 	int base_addr, chnl_addr;
 	int value;
-	static int channel_index;
+	int channel_index;
 
 	/* Index of the first channel in which the stop bit is set */
 	channel_index = find_free_channel(sn95031_codec);