storage: lvm: Don't overwrite lvcreate errors
storage: lvm: Don't overwrite lvcreate errors

Before:
$ sudo virsh vol-create-as --pool vgvirt sparsetest --capacity 16M --allocation 0
error: Failed to create vol sparsetest
error: internal error Child process (/usr/sbin/lvchange -aln vgvirt/sparsetest) unexpected exit status 5:   One or more specified logical volume(s) not found.

After:
$ sudo virsh vol-create-as --pool vgvirt sparsetest --capacity 16M --allocation 0
error: Failed to create vol sparsetest
error: internal error Child process (/usr/sbin/lvcreate --name sparsetest -L 0K --virtualsize 16384K vgvirt) unexpected exit status 5:   Unable to create new logical volume with no extents

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