ASoC: wm8993: Remove unused pointer in wm8993_remove()

Commit 88b5bdf (ASoC: wm8993: drop regulator_bulk_free of devm_ allocated
data) eliminated the last user of driver data pointer 'wm8993' in function
wm8993_remove() - Thus remove it. Detected by Coverity: CID 1186208.

Signed-off-by: Christian Engelmayer <cengelma@gmx.at>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/codecs/wm8993.c

@@ -1559,8 +1559,6 @@ static int wm8993_probe(struct snd_soc_codec *codec)
 
 static int wm8993_remove(struct snd_soc_codec *codec)
 {
-	struct wm8993_priv *wm8993 = snd_soc_codec_get_drvdata(codec);
-
 	wm8993_set_bias_level(codec, SND_SOC_BIAS_OFF);
 	return 0;
 }