Remove some dead code, add default paths to switch() to make static analyzers happy

Check was done with scan-build from the LLVM suite. The remaining reports are false
positives and have been reported to llvm:

http://llvm.org/bugs/show_bug.cgi?id=4358
http://llvm.org/bugs/show_bug.cgi?id=4359

src/layout.c

@@ -336,9 +336,6 @@ void render_container(xcb_connection_t *conn, Container *container) {
                         xcb_configure_window(conn, stack_win->window, mask, values);
                 }
 
-                /* Reconfigure the currently focused client, if necessary. It is the only visible one */
-                client = container->currently_focused;
-
                 /* Render the decorations of all clients */
                 CIRCLEQ_FOREACH(client, &(container->clients), clients) {
                         /* If the client is in fullscreen mode, it does not get reconfigured */