mmc: sdhci-sprd: Check the enable clock's return value correctly

Missed to check the enable clock's return value, fix it.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-sprd.c

@@ -368,7 +368,7 @@ static int sdhci_sprd_probe(struct platform_device *pdev)
 	if (ret)
 		goto pltfm_free;
 
-	clk_prepare_enable(sprd_host->clk_enable);
+	ret = clk_prepare_enable(sprd_host->clk_enable);
 	if (ret)
 		goto clk_disable;