clone: fix options '-o' and '--origin' to be recognised again

Due to a subtle typo in a shell case pattern neither alternative worked.

Signed-off-by: Marco Roeland <marco.roeland@xs4all.nl>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-clone.sh

@@ -152,7 +152,7 @@ do
 		die "clones are always made with separate-remote layout" ;;
 	--reference)
 		shift; reference="$1" ;;
-	-o,--origin)
+	-o|--origin)
 		shift;
 		case "$1" in
 		'')