Make "git-rev-list" work within subdirectories

This trivial patch makes "git-rev-list" able to handle not being in
the top-level directory.  This magically also makes "git-whatchanged"
do the right thing.

Trivial scripting fix to make sure that "git log" also works.
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

git-log-script

 #!/bin/sh
-. git-sh-setup-script || die "Not a git archive"
-revs=$(git-rev-parse --revs-only --default HEAD "$@")
+revs=$(git-rev-parse --revs-only --default HEAD "$@") || exit
 [ "$revs" ] || die "No HEAD ref"
 git-rev-list --pretty $(git-rev-parse --default HEAD "$@") | LESS=-S ${PAGER:-less}

rev-list.c

@@ -481,6 +481,7 @@ static void handle_one_commit(struct commit *com, struct commit_list **lst)
 int main(int argc, char **argv)
 {
 	struct commit_list *list = NULL;
+	const char *prefix = setup_git_directory();
 	int i, limited = 0;
 
 	for (i = 1 ; i < argc; i++) {