Improve style and fix a possible use-after-free case introduced in r268384
by reinitializing the 'freestate' pointer after freeing the memory.

Obtained from: HardenedBSD (71fab80c5dd3034b71a29a61064625018671bbeb)
PR: 194525
Submitted by: Oliver Pinter <oliver.pinter@hardenedbsd.org>
MFC after: 2 weeks