Merged revisions 155861 via svnmerge from

Merged revisions 155861 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.4

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r155861 | mmichelson | 2008-11-10 15:07:39 -0600 (Mon, 10 Nov 2008) | 14 lines

Channel drivers assume that when their indicate callback
is invoked, that the channel on which the callback was called
is locked. This patch corrects an instance in chan_agent where
a channel's indicate callback is called directly without first
locking the channel.

This was leading to some observed locking issues in chan_local,
but considering that all channel drivers operate under the
same expectations, the generic fix in chan_agent is the right
way to go.

AST-126

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@155863 65c4cc65-6c06-0410-ace0-fbb531ad65f3