This commit replaces multiple fw_setenv calls by the bulk one to reduce
flash writes.
Thanks @Linaro1985 for the idea.
Signed-off-by: Mikhail Zhilkin <csharper2005@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/17580
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit a6b0abf4661e4dc1449494e46340f75c44df81de)