Revert "busybox: ensure /storage will be unmounted, dont unmount filesystems we dont need unmount"

This reverts commit 6529b6abf1.

packages/sysutils/busybox/init.d/01_mount-filesystem

@@ -38,16 +38,11 @@ case $RUNLEVEL in
 
   poweroff|reboot)
     progress "unmounting filesystems"
-      for i in 1 2 3 4 5 6 7 8 9 10; do
-        echo "umount /storage"
-        ERR_ENV=1
-        umount /storage
-        [ "$?" -eq "0" ] && ERR_ENV=0 && break
-        usleep 1000000
-      done
-      if [ "$ERR_ENV" -ne "0" ]; then
-        mount -o remount,ro /storage
-        umount -l /storage
-      fi
+      umount /storage
+      umount /var
+      umount /run
+      umount /dev/shm
+      umount /dev/pts
+      umount /dev
     ;;
 esac