Convert these two functions and the functions that underlie them to take
pointers to struct object_id. This is a prerequisite to convert
resolve_gitlink_ref. Fix a stray tab in the middle of the index_mem
call in index_pipe by converting it to a space.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>