rlm_sql: readclients segmentation fault

[Alan DeKok]

Milan Holub wrote:

> However here is another bug report:):
> * cvs head
> * all NASes in nas table(clients.conf not used)
> * sending HUP results in segmentation fault when re-building up internal
> clients structure:

  Ok... I've added more code to re-set pointers on cleanup, and create
them on creation.

  Alan DeKok.
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