sensorhandler: Fix uninitialized reads

The response struct in GetSensorThresholdsResponse was not initialized
and has arbitrary data leftover from the stack. Some values like upper
and lower non-recoverable never get initialized and end up with
garbage data being reported.

Change-Id: I766f8daeb60c1ebc987cff6a24f8d8d78d64ffdd
Signed-off-by: William A. Kennington III <wak@google.com>
1 file changed