Fix bug #203

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4973 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fix missing channel refcount release. Use PBX_CHANNEL_TYPE instead of ast_channel (compatibility asterisk 1.6)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4974 43c1dc8c-776e-4df2-8ef1-6e829299be21