ASoC: tegra: Remove unused variable

Fixes the following warning:

sound/soc/tegra/tegra_alc5632.c: In function 'tegra_alc5632_asoc_init':
sound/soc/tegra/tegra_alc5632.c:118:6: warning: unused variable 'ret' [-Wunused-variable]

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>