Again I am not sure why this was missed during the last round,
but git-diff-files mishandles symlinks on the filesystem.  This
patch fixes it.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

And I'm not sure why did I miss this patch before. Sorry.
Signed-off-by: NPetr Baudis <pasky@ucw.cz>