Catch a possible NULL pointer deref in case the offsets got mangled

somehow.
As a consequence we may now get an unexpected result(*).
Catch that error cases with a well defined panic giving appropriate
pointers to ease debugging.

(*) While the concensus was that the case should never happen unless
    there was a bug, noone was definitively sure.

Discussed with:		kmacy (about 8 months back)
Reviewed by:		silby (as part of a larger patch in March)
MFC after:		2 months

0 files changed, 0 insertions, 0 deletions