scripts/ubinize-image.sh: fix ubinize-image.sh when used with --kernel

r41359 broke support for building ubinized images which do
include a kernel volume.

Signed-off-by: Daniel Golle <[email protected]>

SVN-Revision: 41368

scripts/ubinize-image.sh

@@ -65,6 +65,7 @@ while [ "$1" ]; do
 	"--kernel")
 		kernel="$2"
 		shift
+		shift
 		continue
 		;;
 	"-"*)