net: phy: mscc: shorten `x != 0` condition to `x`

`if (x != 0)` is basically a more verbose version of `if (x)` so let's
use the latter so it's consistent throughout the whole driver.
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NQuentin Schulz <quentin.schulz@bootlin.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/phy/mscc.c

@@ -310,7 +310,7 @@ static int vsc85xx_mdix_set(struct phy_device *phydev, u8 mdix)
 			     DISABLE_HP_AUTO_MDIX_MASK);
 	}
 	rc = phy_write(phydev, MSCC_PHY_BYPASS_CONTROL, reg_val);
-	if (rc != 0)
+	if (rc)
 		return rc;
 
 	reg_val = 0;
@@ -425,14 +425,14 @@ static int vsc85xx_wol_set(struct phy_device *phydev,
 		reg_val = phy_read(phydev, MII_VSC85XX_INT_MASK);
 		reg_val |= MII_VSC85XX_INT_MASK_WOL;
 		rc = phy_write(phydev, MII_VSC85XX_INT_MASK, reg_val);
-		if (rc != 0)
+		if (rc)
 			goto out_unlock;
 	} else {
 		/* Disable the WOL interrupt */
 		reg_val = phy_read(phydev, MII_VSC85XX_INT_MASK);
 		reg_val &= (~MII_VSC85XX_INT_MASK_WOL);
 		rc = phy_write(phydev, MII_VSC85XX_INT_MASK, reg_val);
-		if (rc != 0)
+		if (rc)
 			goto out_unlock;
 	}
 	/* Clear WOL iterrupt status */
@@ -603,7 +603,7 @@ static int vsc85xx_mac_if_set(struct phy_device *phydev,
 		goto out_unlock;
 	}
 	rc = phy_write(phydev, MSCC_PHY_EXT_PHY_CNTL_1, reg_val);
-	if (rc != 0)
+	if (rc)
 		goto out_unlock;
 
 	rc = genphy_soft_reset(phydev);