spi: mpc512x: fix reference leak to master in mpc512x_psc_spi_do_remove()

spi: mpc512x: fix reference leak to master in mpc512x_psc_spi_do_remove()

Once a spi_master_get() call succeeds, we need an additional
spi_master_put() call to free the memory, otherwise we will
leak a reference to master. Fix by removing the unnecessary
spi_master_get() call.

Fixes: 296000d06ea3 ('spi: mpc512x: use devm_spi_register_master()')
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Mark Brown <broonie@linaro.org>