[gnome-sudoku] Remove superfluous parameter from update_undo

[Michael Catanzaro <mcatanzaro src gnome org>]

commit b6758b5446fcd51cc57262884f324613629cc0ef
Author: shak-mar <shakmar openmailbox org>
Date:   Tue Jul 9 21:55:53 2019 +0200

    Remove superfluous parameter from update_undo

 lib/sudoku-game.vala | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/lib/sudoku-game.vala b/lib/sudoku-game.vala
index 957361b..99b2faf 100644
--- a/lib/sudoku-game.vala
+++ b/lib/sudoku-game.vala
@@ -76,7 +76,7 @@ public class SudokuGame : Object
     public void insert (int row, int col, int val)
     {
         var old_val = board[row, col];
-        update_undo (row, col, old_val, val);
+        update_undo (row, col, old_val);
 
         if (mode == GameMode.CREATE)
         {
@@ -92,7 +92,7 @@ public class SudokuGame : Object
     public void remove (int row, int col)
     {
         int old_val = board[row, col];
-        update_undo (row, col, old_val, 0);
+        update_undo (row, col, old_val);
 
         if (mode == GameMode.CREATE)
         {
@@ -149,7 +149,7 @@ public class SudokuGame : Object
         cell_changed (row, col, old_val, new_val);
     }
 
-    public void update_undo (int row, int col, int old_val, int new_val)
+    public void update_undo (int row, int col, int old_val)
     {
         add_to_stack (undostack, row, col, old_val);
         redostack.clear ();