Archives: Reduced duplicate code in RomFS and SaveCheck.

Fixed a few warnings and cleaned up the code

src/core/file_sys/archive_savedatacheck.h

@@ -0,0 +1,31 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+
+#include "common/common_types.h"
+
+#include "core/file_sys/ivfc_archive.h"
+#include "core/loader/loader.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+/// File system interface to the SaveDataCheck archive
+class Archive_SaveDataCheck final : public IVFCArchive {
+public:
+    Archive_SaveDataCheck(const std::string& mount_point);
+
+    std::string GetName() const override { return "SaveDataCheck"; }
+    ResultCode Open(const Path& path) override;
+
+private:
+    std::string mount_point;
+};
+
+} // namespace FileSys