Memory leak in connected line data when SIP blond transfer done.

The handling of the control subclass AST_CONTROL_READ_ACTION frame leaked
connected line string memory in __ast_read().

Also in __ast_read() the frame type switch should not have had a case for
AST_CONTROL_READ_ACTION.  AST_CONTROL_READ_ACTION is not a frame type.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@265608 65c4cc65-6c06-0410-ace0-fbb531ad65f3