lxc: don't do duplicate work when getting pagesize
lxc: don't do duplicate work when getting pagesize

Don't do duplicate work when getting pagesize.

Signed-off-by: Chen Hanxiao <818f8a165c25fa146ecad28e2ef3e3fb996fa364@cn.fujitsu.com>

elmarco/libvirt,cbosdo/libvirt,eskultety/libvirt,jardasgit/libvirt,libvirt/libvirt,zippy2/libvirt,cbosdo/libvirt,rlaager/libvirt,nertpinx/libvirt,agx/libvirt,elmarco/libvirt,andreabolognani/libvirt,taget/libvirt,libvirt/libvirt,zhlcindy/libvirt-1.1.4-maintain,zhlcindy/libvirt-1.1.4-maintain,zippy2/libvirt,crobinso/libvirt,taget/libvirt,jardasgit/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,nertpinx/libvirt,datto/libvirt,taget/libvirt,olafhering/libvirt,VenkatDatta/libvirt,zhlcindy/libvirt-1.1.4-maintain,VenkatDatta/libvirt,eskultety/libvirt,jfehlig/libvirt,jardasgit/libvirt,rlaager/libvirt,libvirt/libvirt,datto/libvirt,datto/libvirt,cbosdo/libvirt,zippy2/libvirt,rlaager/libvirt,agx/libvirt,crobinso/libvirt,zhlcindy/libvirt-1.1.4-maintain,agx/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,cbosdo/libvirt,VenkatDatta/libvirt,shugaoye/libvirt,shugaoye/libvirt,fabianfreyer/libvirt,eskultety/libvirt,cbosdo/libvirt,zhlcindy/libvirt-1.1.4-maintain,andreabolognani/libvirt,jfehlig/libvirt,andreabolognani/libvirt,libvirt/libvirt,rlaager/libvirt,shugaoye/libvirt,taget/libvirt,taget/libvirt,olafhering/libvirt,nertpinx/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,crobinso/libvirt,elmarco/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,agx/libvirt,olafhering/libvirt,eskultety/libvirt,rlaager/libvirt,shugaoye/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,elmarco/libvirt,nertpinx/libvirt,datto/libvirt,andreabolognani/libvirt,datto/libvirt,shugaoye/libvirt,eskultety/libvirt,elmarco/libvirt,zippy2/libvirt,agx/libvirt,jfehlig/libvirt,crobinso/libvirt,olafhering/libvirt