fix: increase *ppos in tictactoe_write

tictactoe_main.c

@@ -128,6 +128,8 @@ static ssize_t tictactoe_write(struct file *file, const char __user *buf,
 		tictactoe_game_init(tictactoe_current_game);
 		mutex_unlock(&tictactoe_mutex_current_game);
 		kfree(command_buf);
+
+		*ppos += count;
 		return count;
 	}
 
@@ -169,6 +171,8 @@ static ssize_t tictactoe_write(struct file *file, const char __user *buf,
 	}
 
 	mutex_unlock(&tictactoe_mutex_current_game);
+
+	*ppos += count;
 	return count;
 }