mmc: sdhci-esdhc-imx: fix return value check in sdhci_esdhc_imx_probe()

In case of error, the function devm_kzalloc() returns NULL pointer not
ERR_PTR(). The IS_ERR() test in the return value check should be
replaced with NULL test.

Fixes: fadac7488064 ("mmc: sdhci-esdhc-imx: add CMDQ support")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-esdhc-imx.c

@@ -1500,8 +1500,8 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
 	if (imx_data->socdata->flags & ESDHC_FLAG_CQHCI) {
 		host->mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD;
 		cq_host = devm_kzalloc(&pdev->dev, sizeof(*cq_host), GFP_KERNEL);
-		if (IS_ERR(cq_host)) {
-			err = PTR_ERR(cq_host);
+		if (!cq_host) {
+			err = -ENOMEM;
 			goto disable_ahb_clk;
 		}