Do not ignore return value of request callback.
Do not ignore return value of request callback.

Bug: https://jira.iotivity.org/browse/IOT-2757
Change-Id: I6a3056db8fce56ac615729de9c8e4747c83446bc
Signed-off-by: Todd Malsbary <8856a5d8416dae6d0ae52d024d7a973f628fb21e@intel.com>

rzr/iotivity,rzr/iotivity,rzr/iotivity,iotivity/iotivity,iotivity/iotivity,rzr/iotivity,iotivity/iotivity,iotivity/iotivity,iotivity/iotivity,iotivity/iotivity,rzr/iotivity,iotivity/iotivity,rzr/iotivity,iotivity/iotivity,rzr/iotivity