git-sh-setup: die if outside git repository.

Now all the users of this script detect its exit status and die,
complaining that it is outside git repository.  So move the code
that dies from all callers to git-sh-setup script.

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

git-count-objects.sh

@@ -3,7 +3,7 @@
 # Copyright (c) 2005 Junio C Hamano
 #
 
-. git-sh-setup || die "Not a git repository"
+. git-sh-setup
 
 dc </dev/null 2>/dev/null || {
 	# This is not a real DC at all -- it just knows how