mmc: mxs-mmc: fix error return code in mxs_mmc_probe()

Fix to return -ENODEV in the request dma error case instead
of 0, as done elsewhere in this function.
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Reviewed-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NChris Ball <cjb@laptop.org>

drivers/mmc/host/mxs-mmc.c

@@ -639,6 +639,7 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 	if (!ssp->dmach) {
 		dev_err(mmc_dev(host->mmc),
 			"%s: failed to request dma\n", __func__);
+		ret = -ENODEV;
 		goto out_clk_put;
 	}