Fixes the following sparse warnings:
sound/soc/tegra/tegra30_ahub.c:583:16: warning:
Using plain integer as NULL pointer
sound/soc/tegra/tegra30_ahub.c:600:16: warning:
Using plain integer as NULL pointer
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Reviewed-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>