Fix cli:'sccp message device(s)' command (Reported/Patched by Jim Dossey)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5516 43c1dc8c-776e-4df2-8ef1-6e829299be21
Prevent compile warning about array subscript (Reported by Jim Dossey)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5517 43c1dc8c-776e-4df2-8ef1-6e829299be21