Since it is not possible for curthread to be NULL in this context, drop the check+initialization for a straight initialization. Also assert that curthread will never be NULL just to be sure.
Since it is not possible for curthread to be NULL in this context,
drop the check+initialization for a straight initialization. Also
assert that curthread will never be NULL just to be sure.

Discussed with:	rwatson, peter
MFC after:	1 week

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