When the fan control script was first implemented, a variable was wrongly
named. The fan probably never turns on - fix that.
Signed-off-by: Andreas Böhler <dev@aboehler.at>
Link: https://github.com/openwrt/openwrt/pull/22531
Signed-off-by: Robert Marko <robimarko@gmail.com>
(cherry picked from commit 41d6584d9b)