remove /var/lib/mock after build

ci-build-mock.sh

@@ -21,7 +21,7 @@ mock -r fedora-25-x86_64 --install lorax-lmc-novirt git vim-minimal pykickstart
 mock -r fedora-25-x86_64 --chroot "livemedia-creator --ks tigeros.ks --no-virt --resultdir /var/lmc --project TigerOS-Live --make-iso --volid TigerOS --iso-only --iso-name TigerOS.iso --releasever 25 --title TigerOS-live --macboot"
 rm -rf /srv/isos/TigerOS-$(date +%Y%m%d).iso
 mock -r fedora-25-x86_64 --copyout /var/lmc/TigerOS.iso /srv/isos/TigerOS-$(date +%Y%m%d).iso 
-rm -rf /var/lmc/
+rm -rf /var/lib/mock/
 cd /srv/isos
 rm -rf CHECKSUM512-$(date +%Y%m%d)
 sha512sum TigerOS-$(date +%Y%m%d).iso > CHECKSUM512-$(date +%Y%m%d)