fix typo

Author: zaoqi

Makefile

@@ -5,13 +5,13 @@ all: $(PACKAGE).zip
 rootfs.ext3.base:
 	dd if=/dev/zero of=rootfs.ext3.base bs=10M count=1
 	mkfs.ext3 rootfs.ext3.base
-	resize2fs rootfs.ext3.base 1248
+	resize2fs -M rootfs.ext3.base
 	tune2fs -i 0 -c 0 rootfs.ext3.base
 
 rootfs.ext4.base:
 	dd if=/dev/zero of=rootfs.ext4.base bs=10M count=1
-	mkfs.ext3 rootfs.ext4.base
-	resize2fs rootfs.ext4.base 1539
+	mkfs.ext4 rootfs.ext4.base
+	resize2fs -M rootfs.ext4.base
 	tune2fs -i 0 -c 0 rootfs.ext4.base
 
 menu.json: gen.menu.json.js