ASoC: tegra: Fix unused variable 'spdif' warning

Fix below build warning:
  CC [M]  sound/soc/tegra/tegra20_spdif.o
sound/soc/tegra/tegra20_spdif.c: In function 'tegra20_spdif_platform_remove':
sound/soc/tegra/tegra20_spdif.c:361:24: warning: unused variable 'spdif' [-Wunused-variable]
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Vaishali Thakkar <vthakkar1994@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/tegra20_spdif.c

@@ -358,8 +358,6 @@ static int tegra20_spdif_platform_probe(struct platform_device *pdev)
 
 static int tegra20_spdif_platform_remove(struct platform_device *pdev)
 {
-	struct tegra20_spdif *spdif = dev_get_drvdata(&pdev->dev);
-
 	pm_runtime_disable(&pdev->dev);
 	if (!pm_runtime_status_suspended(&pdev->dev))
 		tegra20_spdif_runtime_suspend(&pdev->dev);