stmmac: dwmac-sti: remove useless of_node check

Since dwmac-sti is a DT only driver checking for OF node is not necessary.
Signed-off-by: NJoachim Eastwood <manabian@gmail.com>
Acked-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
Tested-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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

@@ -270,9 +270,6 @@ static int sti_dwmac_parse_data(struct sti_dwmac *dwmac,
 	struct regmap *regmap;
 	int err;
 
-	if (!np)
-		return -EINVAL;
-
 	/* clk selection from extra syscfg register */
 	dwmac->clk_sel_reg = -ENXIO;
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sti-clkconf");