network: Need to free formatted addr in networkDnsmasqConfContents
network: Need to free formatted addr in networkDnsmasqConfContents

Commit id '0b6336c2' formatted the 'addr', but didn't VIR_FREE it.

Found by Coverity.

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