mmc: mxs-mmc: Fix a resource leak in an error handling path in 'mxs_mmc_probe()'

If 'mmc_of_parse()' fails, we must undo the previous 'dma_request_chan()'
call.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/20201208203527.49262-1-christophe.jaillet@wanadoo.frSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/mxs-mmc.c

@@ -628,7 +628,7 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 
 	ret = mmc_of_parse(mmc);
 	if (ret)
-		goto out_clk_disable;
+		goto out_free_dma;
 
 	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;