caif_virtio: fix wrong pointer check in cfv_probe()

del_vqs() frees virtqueues, therefore cfv->vq_tx pointer should be checked
for NULL before calling it, not cfv->vdev. Also the current implementation
is redundant because the pointer cfv->vdev is dereferenced before it is
checked for NULL.

Fix this by checking cfv->vq_tx for NULL instead of cfv->vdev before
calling del_vqs().

Fixes: 0d2e1a2 ("caif_virtio: Introduce caif over virtio")
Signed-off-by: Vitaliy Shevtsov <[email protected]>
Reviewed-by: Gerhard Engleder <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Vitaliy Shevtsov

drivers/net/caif/caif_virtio.c

@@ -745,7 +745,7 @@ static int cfv_probe(struct virtio_device *vdev)
 
 	if (cfv->vr_rx)
 		vdev->vringh_config->del_vrhs(cfv->vdev);
-	if (cfv->vdev)
+	if (cfv->vq_tx)
 		vdev->config->del_vqs(cfv->vdev);
 	free_netdev(netdev);
 	return err;