CDROM: Fix crash when loading save state from different system

src/core/cdrom.cpp

@@ -195,9 +195,9 @@ void CDROM::InsertMedia(std::unique_ptr<CDImage> media)
   m_reader.SetMedia(std::move(media));
 }
 
-void CDROM::RemoveMedia()
+void CDROM::RemoveMedia(bool force /* = false */)
 {
-  if (!m_reader.HasMedia())
+  if (!m_reader.HasMedia() && !force)
     return;
 
   Log_InfoPrintf("Removing CD...");

src/core/cdrom.h

@@ -31,7 +31,7 @@ public:
   bool HasMedia() const;
   std::string GetMediaFileName() const;
   void InsertMedia(std::unique_ptr<CDImage> media);
-  void RemoveMedia();
+  void RemoveMedia(bool force = false);
 
   // I/O
   u8 ReadRegister(u32 offset);

src/core/system.cpp

@@ -327,6 +327,7 @@ bool System::DoState(StateWrapper& sw)
   std::string media_filename = m_cdrom->GetMediaFileName();
   sw.Do(&media_filename);
 
+  bool media_is_bad = false;
   if (sw.IsReading())
   {
     std::unique_ptr<CDImage> media;
@@ -334,7 +335,10 @@ bool System::DoState(StateWrapper& sw)
     {
       media = CDImage::Open(media_filename.c_str());
       if (!media)
-        Log_ErrorPrintf("Failed to open CD image from save state: '%s'", media_filename.c_str());
+      {
+        Log_ErrorPrintf("Failed to open CD image from save state: '%s'. Disc will be removed.", media_filename.c_str());
+        media_is_bad = true;
+      }
     }
 
     UpdateRunningGame(media_filename.c_str(), media.get());
@@ -384,6 +388,9 @@ bool System::DoState(StateWrapper& sw)
   if (!sw.DoMarker("Events") || !DoEventsState(sw))
     return false;
 
+  if (media_is_bad)
+    m_cdrom->RemoveMedia(true);
+
   return !sw.HasError();
 }