mmc: mxs-mmc: remove unneeded NULL check

Static checkers complain about the inconsistent NULL checking here:

	drivers/mmc/host/mxs-mmc.c:680 mxs_mmc_probe()
	warn: variable dereferenced before check 'ssp->dmach' (see line 660)

The variable can't actually be NULL so we can remove the check.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/mxs-mmc.c

@@ -677,7 +677,6 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 	return 0;
 
 out_free_dma:
-	if (ssp->dmach)
 	dma_release_channel(ssp->dmach);
 out_clk_disable:
 	clk_disable_unprepare(ssp->clk);