grovel: fix CVAR's Lisp-side expansion.
grovel: fix CVAR's Lisp-side expansion.

Patch courtesy of pinterface. Fixes LP bug #852192.

stassats/cffi,akovalenko/cffi,stassats/cffi,3b/cffi,dkochmanski/cffi,dkochmanski/cffi,cffi/cffi,akovalenko/cffi,cffi/cffi,mcna/cffi,attila-lendvai/cffi,cffi/cffi,stassats/cffi,dkochmanski/cffi,akovalenko/cffi,3b/cffi,3b/cffi,mcna/cffi,attila-lendvai/cffi