rest_router: fix of10 case
rest_router: fix of10 case

looks like a regression in commit db40bc0f98abc84dcdbd3fa4d19aa573d94188d9.
(rest_router: follow packet lib api change)

Signed-off-by: YAMAMOTO Takashi <458bba2e4a8704776b33478100c98529b639cd9e@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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