qemuhotplugtest: Only read result_filename if used
qemuhotplugtest: Only read result_filename if used

Signed-off-by: Martin Kletzander <e82f23e74d43760279ebcc505dac4ae70d5627d0@redhat.com>

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