Remove pointless return values in nwfilter methods
Remove pointless return values in nwfilter methods

Many nwfilter methods have an int return value but only ever
return 0 and their callers never check the return value either.
These methods can all be void.

Signed-off-by: Daniel P. Berrange <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

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