3910 t_look(3NSL) should never return T_ERROR
Reviewed by: Marcel Telka <marcel@telka.sk>
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Approved by: Dan McDonald <danmcd@omniti.com>

6692913 MBLKL generates E_PTRDIFF_OVERFLOW lint warnings
6717598 MBLKSIZE() causes lint pointer-difference warnings

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