1. As this is for MTD-based devices, the Kconfig dependency should be MTD
instead of only spi-nor flashes
2. Initialize saved_buf to avoid crash on free()
3. Remaining size should be set correctly to write_size
Fixes: 03fb08d4ae (env: Introduce support for MTD)
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
Reviewed-by: Christian Marangi <ansuelsmth@gmail.com>
7c52bca812