ASoC: samsung: Fix checking return value of clk_get

clk_get() returns a pointer to the struct clk or an ERR_PTR().
This patch also use PTR_ERR() for return value.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --cc sound/soc/samsung/s3c2412-i2s.c
Simple merge

diff --cc sound/soc/samsung/s3c24xx-i2s.c
Simple merge

diff --cc sound/soc/samsung/s3c24xx_uda134x.c
Simple merge