Merged revisions 73769 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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r73769 | russell | 2007-07-06 18:02:58 -0500 (Fri, 06 Jul 2007) | 12 lines

Merged revisions 73768 via svnmerge from 
https://origsvn.digium.com/svn/asterisk/branches/1.2

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r73768 | russell | 2007-07-06 18:01:22 -0500 (Fri, 06 Jul 2007) | 4 lines

If a sip_pvt struct has already registered an extension state callback,
remove the old one before adding a new one.  If this isn't done, Asterisk
will crash.  (issue #10120)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@73771 65c4cc65-6c06-0410-ace0-fbb531ad65f3