spi: spi-cavium-thunderx: Add missing clk_disable_unprepare()

Add the missing clk_disable_unprepare() before return in the probe
error handling case and remove.

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
1 file changed