qemu_monitor_json: Follow our coding style
qemu_monitor_json: Follow our coding style

In majority of our functions we have this variable @ret that is
overwritten a lot. In other areas of the code we use 'goto
cleanup;' just so that this wouldn't happen. But here.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

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