Fix build with polkit0
Fix build with polkit0

Commit 8dd623b9 introduced a build error with --enable-compile-warnings=error

  remote.c:2593: error: unused variable 'rv' [-Wunused-variable]

Pushing under build-breaker rule.

VenkatDatta/libvirt,trainstack/libvirt,agx/libvirt,jeckersb/libvirt,jardasgit/libvirt,jfehlig/libvirt,foomango/libvirt,datto/libvirt,wiedi/libvirt,olafhering/libvirt,nertpinx/libvirt,warewolf/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,rmarwaha/libvirt,eskultety/libvirt,bjzhang/libvirt,fabianfreyer/libvirt,rmarwaha/libvirt,datto/libvirt,VenkatDatta/libvirt,bjzhang/libvirt,rlaager/libvirt,siboulet/libvirt-openvz,rmarwaha/libvirt1,rlaager/libvirt,olafhering/libvirt,andreabolognani/libvirt,rmarwaha/libvirt,taget/libvirt,jardasgit/libvirt,libvirt/libvirt,warewolf/libvirt,iam-TJ/libvirt,trainstack/libvirt,siboulet/libvirt-openvz,siboulet/libvirt-openvz,foomango/libvirt,zhlcindy/libvirt-1.1.4-maintain,iam-TJ/libvirt,foomango/libvirt,novel/fbsd-libvirt,iam-TJ/libvirt,shugaoye/libvirt,nertpinx/libvirt,rmarwaha/libvirt,agx/libvirt,emaste/libvirt,siboulet/libvirt-openvz,elmarco/libvirt,jeckersb/libvirt,wiedi/libvirt,fabianfreyer/libvirt,dumbbell/libvirt,dumbbell/libvirt,novel/fbsd-libvirt,jeckersb/libvirt,andreabolognani/libvirt,wiedi/libvirt,jfehlig/libvirt,jeckersb/libvirt,elmarco/libvirt,zippy2/libvirt,eskultety/libvirt,cbosdo/libvirt,dumbbell/libvirt,rmarwaha/libvirt1,eskultety/libvirt,taget/libvirt,agx/libvirt,foomango/libvirt,agx/libvirt,wiedi/libvirt,nertpinx/libvirt,taget/libvirt,jfehlig/libvirt,andreabolognani/libvirt,cbosdo/libvirt,cbosdo/libvirt,jeckersb/libvirt,eskultety/libvirt,rmarwaha/libvirt,novel/fbsd-libvirt,zhlcindy/libvirt-1.1.4-maintain,trainstack/libvirt,cbosdo/libvirt,jardasgit/libvirt,warewolf/libvirt,jeckersb/libvirt,datto/libvirt,warewolf/libvirt,zippy2/libvirt,emaste/libvirt,fabianfreyer/libvirt,wiedi/libvirt,nertpinx/libvirt,rmarwaha/libvirt,warewolf/libvirt,iam-TJ/libvirt,rmarwaha/libvirt1,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,emaste/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,rlaager/libvirt,emaste/libvirt,crobinso/libvirt,zhlcindy/libvirt-1.1.4-maintain,dumbbell/libvirt,elmarco/libvirt,warewolf/libvirt,elmarco/libvirt,wiedi/libvirt,rmarwaha/libvirt1,iam-TJ/libvirt,emaste/libvirt,emaste/libvirt,taget/libvirt,novel/fbsd-libvirt,foomango/libvirt,crobinso/libvirt,wiedi/libvirt,olafhering/libvirt,cbosdo/libvirt,emaste/libvirt,trainstack/libvirt,nertpinx/libvirt,zhlcindy/libvirt-1.1.4-maintain,crobinso/libvirt,novel/fbsd-libvirt,crobinso/libvirt,trainstack/libvirt,shugaoye/libvirt,libvirt/libvirt,elmarco/libvirt,rmarwaha/libvirt1,VenkatDatta/libvirt,rmarwaha/libvirt1,libvirt/libvirt,dumbbell/libvirt,shugaoye/libvirt,bjzhang/libvirt,jeckersb/libvirt,zippy2/libvirt,olafhering/libvirt,datto/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,novel/fbsd-libvirt,trainstack/libvirt,rlaager/libvirt,agx/libvirt,novel/fbsd-libvirt,iam-TJ/libvirt,libvirt/libvirt,novel/fbsd-libvirt,dumbbell/libvirt,iam-TJ/libvirt,bjzhang/libvirt,jardasgit/libvirt,trainstack/libvirt,shugaoye/libvirt,bjzhang/libvirt,jfehlig/libvirt,shugaoye/libvirt,warewolf/libvirt,jardasgit/libvirt,datto/libvirt,rlaager/libvirt,eskultety/libvirt,siboulet/libvirt-openvz,zippy2/libvirt,novel/fbsd-libvirt