fixes #58 sccp_line.c

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4284 43c1dc8c-776e-4df2-8ef1-6e829299be21
fixes #58 sccp_actions.c (suppresses d null deref by checking d first, should never occur though)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4285 43c1dc8c-776e-4df2-8ef1-6e829299be21