When a vcpu sees that a rendezvous is ongoing, it exits and tries to
handle the rendezvous. The vcpu doesn't check if it's part of the
rendezvous or not. If the vcpu isn't part of the rendezvous, the
rendezvous could be done before it reaches the assertion. This will
cause a panic.
The assertion isn't needed at all because vm_handle_rendezvous properly
handles a spurious rendezvous. So, we can just remove it.