[PATCH] drm/virtio: fix vq wait_event condition

[Sasha Levin]

Hi.

[This is an automated email]

This commit has been processed because it contains a -stable tag.
The stable tag indicates that it's relevant for the following trees: all

The bot has also determined it's probably a bug fixing patch. (score: 97.5752)

The bot has tested the following trees: v4.15.15, v4.14.32, v4.9.92, v4.4.126, 

v4.15.15: Build OK!
v4.14.32: Build OK!
v4.9.92: Build OK!
v4.4.126: Build OK!

Please let us know if you'd like to have this patch included in a stable tree.

--
Thanks.
Sasha