Merge branch 'js/fsck-name-objects-fix'

Fix "git fsck --name-objects" which apparently has not been used by
anybody who is motivated enough to report breakage.

* js/fsck-name-objects-fix:
  fsck --name-objects: be more careful parsing generation numbers
  t1450: robustify `remove_object()`

diff --cc fsck.c
Simple merge

diff --cc t/t1450-fsck.sh
Simple merge