Revised sccp_dump_packet

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4260 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fix valgrind 'conditional jump or move depends on uninitialised value'

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4261 43c1dc8c-776e-4df2-8ef1-6e829299be21