Fix error handling in virsh when listing storage volumes
Fix error handling in virsh when listing storage volumes

virsh was not checking for a error code when listing storage
volumes. So when listing volumes in a pool that was shutoff,
no output was displayed

* tools/virsh.c: Fix error handling when listing volumes

danwent/libvirt-ovs,VenkatDatta/libvirt,novel/fbsd-libvirt,cbosdo/libvirt,rbu/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,rmarwaha/libvirt1,datto/libvirt,leilihh/libvirt,jfehlig/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,warewolf/libvirt,agx/libvirt,emaste/libvirt,VenkatDatta/libvirt,iam-TJ/libvirt,trainstack/libvirt,iam-TJ/libvirt,zhlcindy/libvirt-1.1.4-maintain,fabianfreyer/libvirt,danwent/libvirt-ovs,datto/libvirt,trainstack/libvirt,cbosdo/libvirt,taget/libvirt,agx/libvirt,jeckersb/libvirt,nertpinx/libvirt,warewolf/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,taget/libvirt,fabianfreyer/libvirt,jeckersb/libvirt,olafhering/libvirt,wiedi/libvirt,usc-isi/libvirt,emaste/libvirt,shugaoye/libvirt,bjzhang/libvirt,libvirt/libvirt,warewolf/libvirt,zippy2/libvirt,taget/libvirt,wiedi/libvirt,warewolf/libvirt,leilihh/libvirt,crobinso/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,danwent/libvirt-ovs,crobinso/libvirt,usc-isi/libvirt,shugaoye/libvirt,olafhering/libvirt,rmarwaha/libvirt1,novel/fbsd-libvirt,rmarwaha/libvirt1,dumbbell/libvirt,soulxu/libvirt-xuhj,agx/libvirt,foomango/libvirt,zippy2/libvirt,rmarwaha/libvirt1,zippy2/libvirt,iam-TJ/libvirt,wiedi/libvirt,jardasgit/libvirt,elmarco/libvirt,novel/fbsd-libvirt,danwent/libvirt-ovs,novel/fbsd-libvirt,crobinso/libvirt,rmarwaha/libvirt,rmarwaha/libvirt,shugaoye/libvirt,cbosdo/libvirt,VenkatDatta/libvirt,soulxu/libvirt-xuhj,warewolf/libvirt,rlaager/libvirt,eskultety/libvirt,iam-TJ/libvirt,elmarco/libvirt,siboulet/libvirt-openvz,olafhering/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,emaste/libvirt,eskultety/libvirt,jardasgit/libvirt,emaste/libvirt,nertpinx/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,bjzhang/libvirt,dumbbell/libvirt,nertpinx/libvirt,usc-isi/libvirt,dumbbell/libvirt,iam-TJ/libvirt,shugaoye/libvirt,bjzhang/libvirt,rlaager/libvirt,kantai/libvirt-vfork,libvirt/libvirt,andreabolognani/libvirt,elmarco/libvirt,emaste/libvirt,rbu/libvirt,wiedi/libvirt,jardasgit/libvirt,elmarco/libvirt,jeckersb/libvirt,zippy2/libvirt,jeckersb/libvirt,jeckersb/libvirt,novel/fbsd-libvirt,kantai/libvirt-vfork,warewolf/libvirt,dumbbell/libvirt,libvirt/libvirt,eskultety/libvirt,zhlcindy/libvirt-1.1.4-maintain,jeckersb/libvirt,soulxu/libvirt-xuhj,usc-isi/libvirt,olafhering/libvirt,trainstack/libvirt,rmarwaha/libvirt,siboulet/libvirt-openvz,cbosdo/libvirt,novel/fbsd-libvirt,datto/libvirt,foomango/libvirt,dumbbell/libvirt,usc-isi/libvirt,elmarco/libvirt,dumbbell/libvirt,wiedi/libvirt,siboulet/libvirt-openvz,eskultety/libvirt,iam-TJ/libvirt,bjzhang/libvirt,agx/libvirt,warewolf/libvirt,trainstack/libvirt,libvirt/libvirt,shugaoye/libvirt,taget/libvirt,bjzhang/libvirt,trainstack/libvirt,andreabolognani/libvirt,nertpinx/libvirt,rmarwaha/libvirt,datto/libvirt,soulxu/libvirt-xuhj,foomango/libvirt,jeckersb/libvirt,trainstack/libvirt,jardasgit/libvirt,rmarwaha/libvirt1,rmarwaha/libvirt,fabianfreyer/libvirt,agx/libvirt,soulxu/libvirt-xuhj,wiedi/libvirt,datto/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,trainstack/libvirt,rbu/libvirt,jfehlig/libvirt,leilihh/libvirt,novel/fbsd-libvirt,leilihh/libvirt,siboulet/libvirt-openvz,rmarwaha/libvirt1,leilihh/libvirt,andreabolognani/libvirt,kantai/libvirt-vfork,taget/libvirt,rlaager/libvirt,rbu/libvirt,emaste/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,kantai/libvirt-vfork,andreabolognani/libvirt,danwent/libvirt-ovs,zhlcindy/libvirt-1.1.4-maintain,siboulet/libvirt-openvz,novel/fbsd-libvirt,foomango/libvirt,andreabolognani/libvirt,wiedi/libvirt,rlaager/libvirt,foomango/libvirt,eskultety/libvirt,rlaager/libvirt,cbosdo/libvirt,emaste/libvirt,rmarwaha/libvirt,crobinso/libvirt,jfehlig/libvirt,leilihh/libvirt,novel/fbsd-libvirt,iam-TJ/libvirt,rbu/libvirt,kantai/libvirt-vfork,zhlcindy/libvirt-1.1.4-maintain