Possible deadlock in sasl_dispose

[Eric Leblond]

Hi,

It seems there is a possible deadlock in sasl_dispose: if the pointer
pconn is nullified by an other thread, the calling thread will simply
return without freeing the free_mutex mutex.

Attached patch should fix the issue.

BR,
-- 
Eric Leblond
INL: http://www.inl.fr/
NuFW: http://www.nufw.org/
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