Merge branch 'ma/reduce-heads-leakfix' into maint

Leak fixes. * ma/reduce-heads-leakfix: reduce_heads: fix memory leaks builtin/merge-base: free commit lists

Junio C Hamano committed Nov 27, 2017 at 10:57 UTC 80a0e0fdd6b51744a7c76583874e2993df645e47

No changes.