Fix return code for truncated DTLS fragment.
Previously, a truncated DTLS fragment in |dtls1_process_out_of_seq_message| would cause *ok to be cleared, but the return value would still be the number of bytes read. This would cause |dtls1_get_message| not to consider it an error and it would continue processing as normal until the calling function noticed that *ok was zero. I can't see an exploit here because |dtls1_get_message| uses |s->init_num| as the length, which will always be zero from what I can see. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Emilia Käsper <emilia@openssl.org>
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8ca4c4b2
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