ASoC: Remove unused step size from debugfs CODEC write function

We don't use the step size so there's no need to work it out.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>

sound/soc/soc-core.c

@@ -244,7 +244,6 @@ static ssize_t codec_reg_write_file(struct file *file,
 	size_t buf_size;
 	char *start = buf;
 	unsigned long reg, value;
-	int step = 1;
 	struct snd_soc_codec *codec = file->private_data;
 
 	buf_size = min(count, (sizeof(buf)-1));
@@ -252,9 +251,6 @@ static ssize_t codec_reg_write_file(struct file *file,
 		return -EFAULT;
 	buf[buf_size] = 0;
 
-	if (codec->driver->reg_cache_step)
-		step = codec->driver->reg_cache_step;
-
 	while (*start == ' ')
 		start++;
 	reg = simple_strtoul(start, &start, 16);