ASoC: s3c24xx: test wrong variable

After clk_get() mclk is checked three times instead of mout_epll
and sclk_spdif checks.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>