spi: txx9: drop clk_put for devm_clk_get in txx9spi_probe()

devm_clk_get() is used so there is no reason to explicitly
call clk_put() in txx9spi_probe() functions.

Fixes: 18e34d56 ('spi: txx9: Use devm_clk_get()')
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.og>