tree baad31a19f8229679c03366e5d92a88c62d3ae9d
parent 3296159321ec1f211fa3f4c6178c4bd95632ab63
author Barret Rhoden <brho@cs.berkeley.edu> 1569270446 -0400
committer Barret Rhoden <brho@cs.berkeley.edu> 1570569071 -0400

arena: allow freeing NULL

This is a convenience for test code.

Signed-off-by: Barret Rhoden <brho@cs.berkeley.edu>