irqbypass: do not start cons/prod when failed connect

If failed to connect, there is no need to start consumer nor
producer.

Signed-off-by: Zhu Lingshan <[email protected]>
Suggested-by: Jason Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Michael S. Tsirkin <[email protected]>
1 file changed