net: stmmac: fix double-initialization of phy_iface

The variable phy_iface is double-initialized to itself.
This patch remove that.

Reported-by: coverity (CID 1271141)
Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index 11baa4b..0cd3ecf 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -354,7 +354,7 @@
 
 static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)
 {
-	int phy_iface = phy_iface = bsp_priv->phy_iface;
+	int phy_iface = bsp_priv->phy_iface;
 
 	if (enable) {
 		if (!bsp_priv->clk_enabled) {