Call setup_git_directory() early

Any git command that expects to work in a subdirectory of a project, and
that reads the git config files (which is just about all of them) needs to
make sure that it does the "setup_git_directory()" call before it tries to
read the config file.

This means, among other things, that we need to move the call out of
"init_revisions()", and into the caller.

This does the mostly trivial conversion to do that.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-diff-index.c

@@ -15,7 +15,7 @@ int cmd_diff_index(int argc, const char **argv, char **envp)
 	int cached = 0;
 	int i;
 
-	init_revisions(&rev);
+	init_revisions(&rev, setup_git_directory());
 	git_config(git_default_config); /* no "diff" UI options */
 	rev.abbrev = 0;