virtio/vsock: Improve MSG_ZEROCOPY error handling

Add a missing kfree_skb() to prevent memory leaks.

Fixes: 581512a6dc ("vsock/virtio: MSG_ZEROCOPY flag support")
Reviewed-by: Stefano Garzarella <[email protected]>
Signed-off-by: Michal Luczaj <[email protected]>
Acked-by: Arseniy Krasnov <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>

net/vmw_vsock/virtio_transport_common.c

@@ -400,6 +400,7 @@ static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
 			if (virtio_transport_init_zcopy_skb(vsk, skb,
 							    info->msg,
 							    can_zcopy)) {
+				kfree_skb(skb);
 				ret = -ENOMEM;
 				break;
 			}