git-submodule: move ill placed shift.

When running git submodule update -i, the "-i" is shifted before recursing
into cmd_init and then again outside of the loop. This causes some /bin/sh
to complain about shifting when there are no arguments left (and would
discard anything written after -i too).
Signed-off-by: NPierre Habouzit <madcoder@debian.org>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

git-submodule.sh

@@ -269,6 +269,7 @@ cmd_update()
 	do
 		case "$1" in
 		-q|--quiet)
+			shift
 			quiet=1
 			;;
 		-i|--init)
@@ -286,7 +287,6 @@ cmd_update()
 			break
 			;;
 		esac
-		shift
 	done
 
 	git ls-files --stage -- "$@" | grep '^160000 ' |