usb: host: ehci-exynos: Handle return value of clk_prepare_enable

clk_prepare_enable() can fail here and we must check its return value.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-exynos.c

@@ -279,7 +279,9 @@ static int exynos_ehci_resume(struct device *dev)
 	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 	int ret;
 
-	clk_prepare_enable(exynos_ehci->clk);
+	ret = clk_prepare_enable(exynos_ehci->clk);
+	if (ret)
+		return ret;
 
 	ret = exynos_ehci_phy_enable(dev);
 	if (ret) {