Fixed a little crash I had in ISOProperties with Mario Kart Wii, it was trying to read a third unknown partition type.

Effectively toggling throttle in DSP HLE/LLE when the game is running

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3096 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/DiscIO/Src/FileSystemGCWii.cpp

@@ -166,6 +166,8 @@ bool CFileSystemGCWii::InitFileSystem()
 	}
 	else
 	{
+		// Mario Kart Wii gets here on its third partition...
+		// Does it use a fake partition ? another type we don't know ?
 		return false;
 	}