dbuspassive: Fix typo in variable check
dbuspassive: Fix typo in variable check

When setting min, should check for min instead of max.

Signed-off-by: Kun Yi <1f1e6c84c8d73059e2ad4603a830c197526c9da4@gmail.com>
Change-Id: I0097bb329408f807fea6d68ca0055c5d8215aba3

openbmc/phosphor-pid-control,openbmc/phosphor-pid-control