pldm: Fix get the offset value by the sensorEvent method

When the sensorEvent method is triggered and the property value is
obtained, msgSensorOffset should be used insteand of sensorOffset.

s/sensorOffset/msgSensorOffset

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I02405d7b9da82b05150b0f0bd91e28285ef71386
1 file changed