Use newly introduced parse_difftree_raw_line function in the
git_difftree_body subroutine. While at it correct error in
parse_difftree_raw_line (unquote is unprototyped function), and
add comment explaining this function.
It also refactors git_difftree_body somewhat, and tries to fit
it in 80 columns.
Signed-off-by: Jakub Narebski <jnareb@gmail.com> Signed-off-by: Junio C Hamano <junkio@cox.net>