s3c2412_i2s_probe() might fail so driver has to revert work done by
s3c_i2sv2_probe() (clock enabling).  Missing doing this would lead to
clock enable in-balance.
Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org>
Acked-by: NArvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>