examples/packet_ordering: move creation of reorder buffer
examples/packet_ordering: move creation of reorder buffer

There was no error checking after calling rte_reorder_create.
Move the creation of the reorder buffer before launching threads
in case of memory error.

Signed-off-by: Sergio Gonzalez Monroy <efb28dd1236fe58fb57f933212eddfe89b9da704@intel.com>

phermansson/dpdk,phermansson/dpdk,phermansson/dpdk,phermansson/dpdk