Fix JSON response lifecycle issues

Move json_object_put calls to fix lifecycle issues exposed by the
json-c upgrade with OE thud.  In the newer version, an extra put
now triggers an assertion, so rework the affected logic to only call
put when needed in the failed request cases.

Bug-AGL: SPEC-2707

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ia111e408abf515e3ea7b105c66c1339daa759a87