[gnome-chess] Fix some new switch warnings

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 9411e198b889bf3a5e56082cc0d918989abc2b20
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sat Dec 5 09:59:08 2020 -0600

    Fix some new switch warnings

 lib/chess-clock.vala | 4 ++--
 lib/chess-move.vala  | 4 ++++
 2 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/lib/chess-clock.vala b/lib/chess-clock.vala
index 4761e73..9c0770f 100644
--- a/lib/chess-clock.vala
+++ b/lib/chess-clock.vala
@@ -206,8 +206,6 @@ public class ChessClock : Object
         int white_move_used = 0, black_move_used = 0;
         switch (clock_type)
         {
-        case ClockType.SIMPLE:
-            break;
         case ClockType.FISCHER:
             if (active_color == Color.WHITE)
                 white_extra_seconds += extra_seconds;
@@ -222,6 +220,8 @@ public class ChessClock : Object
             else
                 black_extra_seconds += int.min (extra_seconds, black_move_used);
             break;
+        default:
+            break;
         }
     }
 }
diff --git a/lib/chess-move.vala b/lib/chess-move.vala
index cc5f58b..bb73c71 100644
--- a/lib/chess-move.vala
+++ b/lib/chess-move.vala
@@ -53,6 +53,8 @@ public class ChessMove : Object
         case CheckState.CHECKMATE:
             builder.append_c ('#');
             break;
+        default:
+            break;
         }
 
         return builder.str;
@@ -105,6 +107,8 @@ public class ChessMove : Object
         case CheckState.CHECKMATE:
             builder.append_c ('#');
             break;
+        default:
+            break;
         }
 
         return builder.str;