usb: phy: return an error in usb_get_phy() if try_module_get() fails

In case we found a matching USB PHY in usb_get_phy() but the call to
try_module_get() fails, we shouldn't return a (probably soon dangling)
pointer but an ERR_PTR instead.

Signed-off-by: Mathias Krause <[e-mail]>
Signed-off-by: Felipe Balbi <[e-mail]>

drivers/usb/phy/phy.c

···
 	if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
 		pr_debug("PHY: unable to find transceiver of type %s\n",
 			usb_phy_type_string(type));
+		if (!IS_ERR(phy))
+			phy = ERR_PTR(-ENODEV);
+
 		goto err0;
 	}