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Segfault prevention for setting default realms.

From: Mats Erik Andersson
Subject: Segfault prevention for setting default realms.
Date: Mon, 2 Jul 2012 21:11:02 +0200
User-agent: Mutt/1.5.18 (2008-05-17)

It happens so that GNU Inetutils had code in the order

   shishi_realm_default_set(*handle, realm);


Illegal order for sure, but it resulted in a segmentation
fault in libshishi. It should be an easy matter to perform
some sanity checks inside shishi_realm_default_set() in
order that the most obvious non-initiated handle be found,
thus returning an error status instead of crashing on a
segmentation fault.

Best regards,

  Mats Erik Andersson

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