[2.51.0] midx-write: fix segfault and other cleanups - #787

[2.51.0] midx-write: fix segfault and other cleanups#787

Johannes Schindelin (dscho) merged 5 commits into

microsoft:vfs-2.51.0microsoft/git:vfs-2.51.0from

derrickstolee:midx-write-free-and-nullderrickstolee/git:midx-write-free-and-nullCopy head branch name to clipboard