net: stmmac: selftests: Use kfree_skb() instead of kfree()

kfree_skb() shall be used instead of kfree(). Fix it.

Fixes: 091810db ("net: stmmac: Introduce selftests support")
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -617,7 +617,7 @@ static int stmmac_test_flowctrl_validate(struct sk_buff *skb,
 	tpriv->ok = true;
 	complete(&tpriv->comp);
 out:
-	kfree(skb);
+	kfree_skb(skb);
 	return 0;
 }