ASoC: fsl-ssi: Add missing clk_disable_unprepare() on error in fsl_ssi_probe()

Add the missing clk_disable_unprepare() before return from
fsl_ssi_probe() in the request irq error handling case.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Mark Brown <broonie@linaro.org>