radv: wait on the high 32 bits of timestamp queries
In case we are unlucky if the low part is 0xffffffff. Fixes: 5d6a560a ("radv: do not use the availability bit for timestamp queries") Signed-off-by:Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by:
Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>