Merge branch 'jk/hash-object-fsck'

"git hash-object" now checks that the resulting object is well formed with the same code as "git fsck". * jk/hash-object-fsck: fsck: do not assume NUL-termination of buffers hash-object: use fsck for object checks fsck: provide a function to fsck buffer without object struct t: use hash-object --literally when created malformed objects t7030: stop using invalid tag name t1006: stop using 0-padded timestamps t1007: modernize malformed object tests