LXC: remove some incorrect setting ATTRIBUTE_UNUSED
LXC: remove some incorrect setting ATTRIBUTE_UNUSED

these parameters shouldn't be marked as ATTRIBUTE_UNUSED.

Signed-off-by: Gao feng <7e9c653c8ec3abfdd967a0616fd143ca77e7b405@cn.fujitsu.com>

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