virtio_error: don't invoke status callbacks

virtio_error: don't invoke status callbacks

Backends don't need to know what frontend requested a reset,
and notifying then from virtio_error is messy because
virtio_error itself might be invoked from backend.

Let's just set the status directly.

Cc: qemu-stable@nongnu.org
Reported-by: Ilya Maximets <i.maximets@samsung.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 8fc47c876de638353bb635872f2c25bb7f4a3d6e)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>