mfd: Fix usbhs_enable error handling

In the case of missing platform_data we do not hold a spin_lock,
thus we should not call spin_unlock_irqrestore in the error path.

Also simplify the error handling by separating the successful path
from error path. I think this change improves readability.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Tested-by: Steve Calfee <stevecalfee@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/mfd/omap-usb-host.c

@@ -700,8 +700,7 @@ static int usbhs_enable(struct device *dev)
 	dev_dbg(dev, "starting TI HSUSB Controller\n");
 	if (!pdata) {
 		dev_dbg(dev, "missing platform_data\n");
-		ret =  -ENODEV;
-		goto end_enable;
+		return  -ENODEV;
 	}
 
 	spin_lock_irqsave(&omap->lock, flags);
@@ -915,7 +914,8 @@ static int usbhs_enable(struct device *dev)
 
 end_count:
 	omap->count++;
-	goto end_enable;
+	spin_unlock_irqrestore(&omap->lock, flags);
+	return 0;
 
 err_tll:
 	if (pdata->ehci_data->phy_reset) {
@@ -931,8 +931,6 @@ err_tll:
 	clk_disable(omap->usbhost_fs_fck);
 	clk_disable(omap->usbhost_hs_fck);
 	clk_disable(omap->usbhost_ick);
-
-end_enable:
 	spin_unlock_irqrestore(&omap->lock, flags);
 	return ret;
 }