net: mii_timestamper: check NULL in unregister_mii_timestamper()

Callers of unregister_mii_timestamper() currently check for NULL
value of mii_ts before calling it.

Place the NULL check inside unregister_mii_timestamper() and update
the callers accordingly.

Signed-off-by: Calvin Johnson <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Suggested-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Ioana Ciornei <[e-mail]>
Acked-by: Grant Likely <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/mdio/of_mdio.c

···
 	else
 		phy = get_phy_device(mdio, addr, is_c45);
 	if (IS_ERR(phy)) {
-		if (mii_ts)
-			unregister_mii_timestamper(mii_ts);
+		unregister_mii_timestamper(mii_ts);
 		return PTR_ERR(phy);
 	}
 
 	rc = of_mdiobus_phy_device_register(mdio, phy, child, addr);
 	if (rc) {
-		if (mii_ts)
-			unregister_mii_timestamper(mii_ts);
+		unregister_mii_timestamper(mii_ts);
 		phy_device_free(phy);
 		return rc;
 	}

drivers/net/phy/mii_timestamper.c

···
 	struct mii_timestamping_desc *desc;
 	struct list_head *this;
 
+	if (!mii_ts)
+		return;
+
 	/* mii_timestamper statically registered by the PHY driver won't use the
 	 * register_mii_timestamper() and thus don't have ->device set. Don't
 	 * try to unregister these.

drivers/net/phy/phy_device.c

···
  */
 void phy_device_remove(struct phy_device *phydev)
 {
-	if (phydev->mii_ts)
-		unregister_mii_timestamper(phydev->mii_ts);
+	unregister_mii_timestamper(phydev->mii_ts);
 
 	device_del(&phydev->mdio.dev);