Iotivity crash on 502 Bad Gateway error

Initialising dimensions with 0 which was not done earlier
In case OCRepPayloadGetPropObjectArray function fails links
become NULL but since dimensions is not initailised with 0 it will
have some garbage value and will enter in loop and crash will occur

https://github.sec.samsung.net/RS7-IOTIVITY/IoTivity/pull/649/commits/3a10bc1df11c5c2bbf7465e3aa06a76adb4734c6
(cherry-picked from 3a10bc1df11c5c2bbf7465e3aa06a76adb4734c6)

Change-Id: I9f156c9f3459ad756d3fde2759aa518d48380d54
Signed-off-by: Sudipto <sudipto.bal@samsung.com>
(cherry picked from commit 176c9ded8f1aeb60bb2e6d9966d7b4253c1cd033)