phylib: phy_startup() should return an error code on failure

phy_startup() calls the PHY driver's startup function, but it ignores the
return code from that function, and so it never returns any failures.

Signed-off-by: Timur Tabi <timur@freescale.com>

drivers/net/phy/phy.c

@@ -723,10 +723,13 @@ struct phy_device *phy_connect(struct mii_dev *bus, int addr,
 	return phydev;
 }
 
+/*
+ * Start the PHY.  Returns 0 on success, or a negative error code.
+ */
 int phy_startup(struct phy_device *phydev)
 {
 	if (phydev->drv->startup)
-		phydev->drv->startup(phydev);
+		return phydev->drv->startup(phydev);
 
 	return 0;
 }