make_image_bootable: pass 3 args to mount_image

bin/cros_make_image_bootable: make_image_bootable should pass only
3 args to the mount_image func

BUG=None
TEST=existing unit tests

Change-Id: Ie24146db3cc8371414c383b16acb3c00a629a6f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2707403
Tested-by: Sergey Frolov <sfrolov@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/bin/cros_make_image_bootable b/bin/cros_make_image_bootable
index 46a09b2..5b32793 100755
--- a/bin/cros_make_image_bootable
+++ b/bin/cros_make_image_bootable
@@ -238,7 +238,7 @@
   if [ ${FLAGS_force_developer_mode} -eq ${FLAGS_TRUE} ]; then
     trap "unmount_image ; die 'cros_make_image_bootable failed.'" EXIT
     mount_image "${image}" "${FLAGS_rootfs_mountpoint}" \
-      "${FLAGS_statefulfs_mountpoint}" "" ""
+      "${FLAGS_statefulfs_mountpoint}"
 
     append_boot_flag "${FLAGS_rootfs_mountpoint}/boot/syslinux/root.A.cfg" \
       "cros_debug" "cros_legacy"