storage: Fix build on i686
storage: Fix build on i686

off_t is signed and it's size is the same as long only on 64b archs.
Thus it cannot be formatted as %lu.

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

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