qemu: Resolve Coverity IDENTICAL_BRANCHES
qemu: Resolve Coverity IDENTICAL_BRANCHES

Coverity complains that in the error paths both the < 0 condition and
the success path after the qemuDomainObjExitMonitor failure will end
up going to cleanup.  So just use ignore_value in this error path to
resolve the complaint.

datto/libvirt,taget/libvirt,andreabolognani/libvirt,olafhering/libvirt,jfehlig/libvirt,eskultety/libvirt,taget/libvirt,fabianfreyer/libvirt,agx/libvirt,eskultety/libvirt,jardasgit/libvirt,datto/libvirt,eskultety/libvirt,olafhering/libvirt,libvirt/libvirt,datto/libvirt,taget/libvirt,libvirt/libvirt,taget/libvirt,nertpinx/libvirt,crobinso/libvirt,andreabolognani/libvirt,eskultety/libvirt,rlaager/libvirt,zippy2/libvirt,jardasgit/libvirt,jardasgit/libvirt,agx/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,crobinso/libvirt,fabianfreyer/libvirt,zippy2/libvirt,nertpinx/libvirt,crobinso/libvirt,datto/libvirt,nertpinx/libvirt,rlaager/libvirt,agx/libvirt,taget/libvirt,agx/libvirt,fabianfreyer/libvirt,zippy2/libvirt,datto/libvirt,agx/libvirt,fabianfreyer/libvirt,olafhering/libvirt,jfehlig/libvirt,nertpinx/libvirt,rlaager/libvirt,VenkatDatta/libvirt,crobinso/libvirt,rlaager/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,libvirt/libvirt,olafhering/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,nertpinx/libvirt,zippy2/libvirt,andreabolognani/libvirt,eskultety/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,libvirt/libvirt,fabianfreyer/libvirt,rlaager/libvirt,jfehlig/libvirt