Remove warnings in ep93xx-i2s.c
Signed-off-by: Alexander Sverdlin <subaparts@yandex.ru>
Acked-by: Ryan Mallon <ryan@bluewatersys.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>