Fix unset line->id (Leonid Korokh)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4423 43c1dc8c-776e-4df2-8ef1-6e829299be21
Replace use of l->id by l->name

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4424 43c1dc8c-776e-4df2-8ef1-6e829299be21
Copy line->name to line->id when empty

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4425 43c1dc8c-776e-4df2-8ef1-6e829299be21