Merge patch series "env: mtd: add the missing put_mtd_device()"

This series from Shiji Yang <yangshiji66@outlook.com> fixes some issues
with the recently added "environment in mtd (generic)" functionality.

Link: https://lore.kernel.org/r/OSBPR01MB1670E56647F1F8B4BA66A931BC59A@OSBPR01MB1670.jpnprd01.prod.outlook.com