MEDIUM: protocol: add a pointer to struct sock_ops to the listener struct

The listener struct is now aware of the socket layer to use upon accept().
At the moment, only sock_raw is supported so this patch should not change
anything.
diff --git a/src/dumpstats.c b/src/dumpstats.c
index 6b4c84e..14d50e1 100644
--- a/src/dumpstats.c
+++ b/src/dumpstats.c
@@ -276,6 +276,7 @@
 			}
 		}
 
+		global.stats_sock.sock = &sock_raw;
 		uxst_add_listener(&global.stats_sock);
 		global.maxsock++;
 	}