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5f8e471f1c
Even though we set the frame to the ast_null_frame and return that, the caller of the frame hook may still need the frame. This now is a bit more careful about when it frees the frame, i.e., only under the same conditions that applied when we duplicated it in the first place. git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@349822 65c4cc65-6c06-0410-ace0-fbb531ad65f3