usb: host: ohci-pxa27x: 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ohci-pxa27x.c

@@ -274,14 +274,16 @@ extern void pxa27x_clear_otgph(void);
 
 static int pxa27x_start_hc(struct pxa27x_ohci *pxa_ohci, struct device *dev)
 {
-	int retval = 0;
+	int retval;
 	struct pxaohci_platform_data *inf;
 	uint32_t uhchr;
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
 
 	inf = dev_get_platdata(dev);
 
-	clk_prepare_enable(pxa_ohci->clk);
+	retval = clk_prepare_enable(pxa_ohci->clk);
+	if (retval)
+		return retval;
 
 	pxa27x_reset_hc(pxa_ohci);
 
@@ -296,8 +298,10 @@ static int pxa27x_start_hc(struct pxa27x_ohci *pxa_ohci, struct device *dev)
 	if (inf->init)
 		retval = inf->init(dev);
 
-	if (retval < 0)
+	if (retval < 0) {
+		clk_disable_unprepare(pxa_ohci->clk);
 		return retval;
+	}
 
 	if (cpu_is_pxa3xx())
 		pxa3xx_u2d_start_hc(&hcd->self);