ASoC: soc-cache: Remove unneeded codec_drv pointer variable in snd_soc_flat_cache_init

Since commit d779fce5d79525d66269c8f6e430e1515d697f3d
"ASoC: soc-cache: Ensure flat compression uses a copy of the defaults cache",
the codec_drv pointer variable is not used any more.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/soc-cache.c

@@ -868,10 +868,6 @@ static int snd_soc_flat_cache_exit(struct snd_soc_codec *codec)
 
 static int snd_soc_flat_cache_init(struct snd_soc_codec *codec)
 {
-	const struct snd_soc_codec_driver *codec_drv;
-
-	codec_drv = codec->driver;
-
 	if (codec->reg_def_copy)
 		codec->reg_cache = kmemdup(codec->reg_def_copy,
 					   codec->reg_size, GFP_KERNEL);