spi: coldfire-qspi: Use clk_disable_unprepare in the remove function

'clk_prepare_enable()' is used in the probe, so 'clk_disable_unprepare()'
should be used in the remove function to be consistent.

Fixes: 499de01c5c0b ("spi: coldfire-qspi: Use clk_prepare_enable and clk_disable_unprepare")
Signed-off-by: Christophe JAILLET <[e-mail]>
Link: https://lore.kernel.org/r/ee91792ddb[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-coldfire-qspi.c

···
 	mcfqspi_wr_qmr(mcfqspi, MCFQSPI_QMR_MSTR);
 
 	mcfqspi_cs_teardown(mcfqspi);
-	clk_disable(mcfqspi->clk);
+	clk_disable_unprepare(mcfqspi->clk);
 
 	return 0;
 }