Use d instead of device in sccp_indicate. Cleanup some of the older comments. Continue instead of break where linedevice->device is not found in sccp_indicate_remote_device

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4645 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fix error handling when poll returns 0 in sccp_socket.c

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4646 43c1dc8c-776e-4df2-8ef1-6e829299be21