Silently exit on ENODEV
Silently exit on ENODEV

ENODEV should be included in the check for "disappeared" device or
directory when hwmon driver is being unloaded. There is a race
condition between unloading drivers and stopping hwmon polling, even
up to several seconds, which exceeds the previous retry period for
ENODEV.

Change-Id: I39c8ae9ea79aa41028f5529c7ea9816d4736fc65
Signed-off-by: Edward A. James <d7c35b0e755c790e6a44b0191856dad0ff983632@us.ibm.com>

openbmc/phosphor-hwmon,openbmc/phosphor-hwmon