app_voicemail: Fix unchecked bounds of myArray in IMAP_STORAGE.
In update_messages_by_imapuser(), messages were appended to a finite
array which resulted in a crash when an IMAP mailbox contained more
than 256 entries. This memory is now dynamically increased as needed.
Observe that this patch adds a bunch of XXX's to questionable code. See
the review (url below) for more information.
ASTERISK-24190 #close
Reported by: Nick Adams
Tested by: Nick Adams
Review: https://reviewboard.asterisk.org/r/4126/
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Merged revisions 426691 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 426692 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 426696 from http://svn.asterisk.org/svn/asterisk/branches/12
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Merged revisions 426702 from http://svn.asterisk.org/svn/asterisk/branches/13
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@426706
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