of14: add some assertions
of14: add some assertions

This is in keeping with
e08ac471d44db846 ("ofproto_v1_3_parser: put some assertions").

Signed-off-by: Simon Horman <a105fd58f578dea0be108941d4c59d15396e1855@verge.net.au>
Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

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