Merged revisions 67804 via svnmerge from

Merged revisions 67804 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.4

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r67804 | mmichelson | 2007-06-06 14:26:55 -0500 (Wed, 06 Jun 2007) | 10 lines

Fix for Issue 9810. There was a segfault under a specific set of circumstances:

1. VoiceMailMain was configured in the dialplan with an extension as its argument
2. A message was left for this mailbox
3. Tried to call VoiceMailMain but hung up before entering password.

This was fixed by checking that a pointer was non-null prior to trying to dereference it.
(Issue 9810, reported by xmarksthespot, patched by Corydon76 with modifications by me).

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@67808 65c4cc65-6c06-0410-ace0-fbb531ad65f3