net: stmmac: fix warning from Sparse for socfpga

Warning:
drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c:122:41:
sparse: cast removes address space of expression
drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c:122:38:
sparse: incorrect type in assignment (different address spaces)
Signed-off-by: NLey Foon Tan <lftan@altera.com>
Acked-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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

@@ -119,8 +119,7 @@ static int socfpga_dwmac_parse_data(struct socfpga_dwmac *dwmac, struct device *
 			return -EINVAL;
 		}
 
-		dwmac->splitter_base = (void *)devm_ioremap_resource(dev,
-			&res_splitter);
+		dwmac->splitter_base = devm_ioremap_resource(dev, &res_splitter);
 		if (!dwmac->splitter_base) {
 			dev_info(dev, "Failed to mapping emac splitter\n");
 			return -EINVAL;