[IOT-2737] Fix build warning in routing layer.
[IOT-2737] Fix build warning in routing layer.

Warning: dereferencing type-punned pointer will
break strict-aliasing rules [-Wstrict-aliasing].

Change-Id: I19a851e0bf16e4b46ba6b7ed1167cb50c4502f18
Signed-off-by: Senthil Kumar G S <0add671b5ee96afb9c3e97fcabc956a9e39ac5ac@samsung.com>
Origin: https://gerrit.iotivity.org/gerrit/#/c/22003/

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