Fix warnings.
Fix warnings.

tienfuc/iotivity-democlient-snap,tienfuc/iotivity-democlient-snap,tienfuc/iotivity-democlient-snap,tienfuc/iotivity-democlient-snap,tienfuc/iotivity-democlient-snap,tienfuc/iotivity-democlient-snap,tienfuc/iotivity-democlient-snap,tienfuc/iotivity-democlient-snap,tienfuc/iotivity-democlient-snap,tienfuc/iotivity-democlient-snap