Fix using uninitialized memory reported by valgrind

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4787 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fix short read in sccp_socket_processdata reported by valgrind

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4788 43c1dc8c-776e-4df2-8ef1-6e829299be21
Making AMI answerCall function a little more precise

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4789 43c1dc8c-776e-4df2-8ef1-6e829299be21