net: stmmac: dwmac-sun8i: Return void from PHY unpower

This is a deinitialization function that always returned zero, and that
return value was always ignored. Have it return void instead.
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c

@@ -820,15 +820,14 @@ static int sun8i_dwmac_power_internal_phy(struct stmmac_priv *priv)
 	return 0;
 }
 
-static int sun8i_dwmac_unpower_internal_phy(struct sunxi_priv_data *gmac)
+static void sun8i_dwmac_unpower_internal_phy(struct sunxi_priv_data *gmac)
 {
 	if (!gmac->internal_phy_powered)
-		return 0;
+		return;
 
 	clk_disable_unprepare(gmac->ephy_clk);
 	reset_control_assert(gmac->rst_ephy);
 	gmac->internal_phy_powered = false;
-	return 0;
 }
 
 /* MDIO multiplexing switch function