Revert "irqbypass: do not start cons/prod when failed connect"

This reverts commit a979a6aa009f3c99689432e0cdb5402a4463fb88.

The reverted commit may cause VM freeze on arm64 with GICv4,
where stopping a consumer is implemented by suspending the VM.
Should the connect fail, the VM will not be resumed, which
is a bit of a problem.

It also erroneously calls the producer destructor unconditionally,
which is unexpected.

Reported-by: Shaokun Zhang <[email protected]>
Suggested-by: Marc Zyngier <[email protected]>
Acked-by: Jason Wang <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
Reviewed-by: Eric Auger <[email protected]>
Tested-by: Shaokun Zhang <[email protected]>
Signed-off-by: Zhu Lingshan <[email protected]>
[maz: tags and cc-stable, commit message update]
Signed-off-by: Marc Zyngier <[email protected]>
Fixes: a979a6aa009f ("irqbypass: do not start cons/prod when failed connect")
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Cc: [email protected]

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