add missing header guard

src/frontend/cia_build_dialog.h

@@ -1,27 +1,29 @@
-// Copyright 2021 threeSD Project
-// Licensed under GPLv2 or any later version
-// Refer to the license.txt file included.
-
-#include <memory>
-#include <utility>
-#include <QDialog>
-#include "core/file_sys/cia_common.h"
-
-namespace Ui {
-class CIABuildDialog;
-}
-
-class CIABuildDialog : public QDialog {
-    Q_OBJECT
-
-public:
-    explicit CIABuildDialog(QWidget* parent, bool is_dir, bool is_nand, bool enable_legit,
-                            const QString& default_path);
-    ~CIABuildDialog();
-
-    std::pair<QString, Core::CIABuildType> GetResults() const;
-
-private:
-    std::unique_ptr<Ui::CIABuildDialog> ui;
-    bool is_dir;
-};
+// Copyright 2021 threeSD Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <utility>
+#include <QDialog>
+#include "core/file_sys/cia_common.h"
+
+namespace Ui {
+class CIABuildDialog;
+}
+
+class CIABuildDialog : public QDialog {
+    Q_OBJECT
+
+public:
+    explicit CIABuildDialog(QWidget* parent, bool is_dir, bool is_nand, bool enable_legit,
+                            const QString& default_path);
+    ~CIABuildDialog();
+
+    std::pair<QString, Core::CIABuildType> GetResults() const;
+
+private:
+    std::unique_ptr<Ui::CIABuildDialog> ui;
+    bool is_dir;
+};