ASoC: tegra: Fix unused variable warning

Fixes: 2a8bd83af30e ("ASoC: tegra: Remove superfluous snd_soc_jack_free_gpios() call")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/tegra_wm8903.c

@@ -203,7 +203,6 @@ static int tegra_wm8903_remove(struct snd_soc_card *card)
 		snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_codec *codec = codec_dai->codec;
-	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
 
 	wm8903_mic_detect(codec, NULL, 0, 0);