put default in switch/case

cli-chansession.c

@@ -446,8 +446,9 @@ do_escape(unsigned char c) {
 			cli_tty_setup();
 			cli_ses.winchange = 1;
 			return 1;
+		default:
+			return 0;
 	}
-	return 0;
 }
 
 static