revision.c: explain what tree_difference does
authorJunio C Hamano <junkio@cox.net>
Wed, 14 Mar 2007 20:12:18 +0000 (13:12 -0700)
committerJunio C Hamano <junkio@cox.net>
Wed, 14 Mar 2007 23:21:19 +0000 (16:21 -0700)
commit0a4ba7f8c6140c516f0ee073a6b71d0db24d6242
tree3e05d7d4dbee708134f89884f2ac9f3d3be4313e
parent822cac015589889c1a9e6d49a2c054b7f1b838ba
revision.c: explain what tree_difference does

This explains how tree_difference variable is used, and updates two
places where the code knows symbolic constant REV_TREE_SAME is 0.

Signed-off-by: Junio C Hamano <junkio@cox.net>
revision.c