drivers: net: stmmac: fix spelling mistake "mulitcast" -> "multicast"

Trivial fix to spelling mistake in dev_warn message.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c

@@ -145,7 +145,7 @@ static void dwmac1000_set_mchash(void __iomem *ioaddr, u32 *mcfilterbits,
 		numhashregs = 8;
 		break;
 	default:
-		pr_debug("STMMAC: err in setting mulitcast filter\n");
+		pr_debug("STMMAC: err in setting multicast filter\n");
 		return;
 		break;
 	}