Add comments for two functions that get called with the appropriate call locked,

but perform operations that could result in the pvt structure getting destroyed
before returning again, causing numerous seg faults all over the module.
(inspired by issues #9642, #9569, and #9666, and the work done by stevedavies
 and mihai)


git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@67119 f38db490-d61c-443f-a65b-d21fe96a405b

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