st21nfca_connectivity_event_received: null check the allocation

devm_kzalloc may fail and return null. So the null check is needed.
Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/nfc/st21nfca/se.c

@@ -317,6 +317,8 @@ int st21nfca_connectivity_event_received(struct nfc_hci_dev *hdev, u8 host,
 
 		transaction = (struct nfc_evt_transaction *)devm_kzalloc(dev,
 						   skb->len - 2, GFP_KERNEL);
+		if (!transaction)
+			return -ENOMEM;
 
 		transaction->aid_len = skb->data[1];
 		memcpy(transaction->aid, &skb->data[2],