linux-imx

virtio-rng: refactor probe error handling

Code like
	vi->vq = NULL;
	kfree(vi)
does not make sense.

Clean it up, use goto error labels for cleanup.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>