Mass Effect 2 demo package crashes STFS handling code

[gibbed]

xenia-vfs-dump.exe!xe::load_and_swap<unsigned char>(const void * mem) Line 236
	at src\xenia\base\memory.h(236)
xenia-vfs-dump.exe!xe::vfs::StfsContainerDevice::GetBlockHash(const unsigned char * map_ptr, unsigned int block_index, unsigned int table_offset) Line 606
	at src\xenia\vfs\devices\stfs_container_device.cc(606)
xenia-vfs-dump.exe!xe::vfs::StfsContainerDevice::ReadSTFS() Line 542
	at src\xenia\vfs\devices\stfs_container_device.cc(542)
xenia-vfs-dump.exe!xe::vfs::StfsContainerDevice::Initialize() Line 85
	at src\xenia\vfs\devices\stfs_container_device.cc(85)
xenia-vfs-dump.exe!xe::vfs::vfs_dump_main(const std::vector<std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> >,std::allocator<std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> > > > & args) Line 35
	at src\xenia\vfs\vfs_dump.cc(35)

src/xenia/vfs/devices/stfs_container_device.cc#L606 src/xenia/vfs/devices/stfs_container_device.cc#L542 src/xenia/vfs/devices/stfs_container_device.cc#L85

When parsing all file information, eventually encounters an invalid block for the file Opening_End_Seq.bik, which is a fairly large file.

This was not broken with the merge of #1254, problem existed prior. Could be related to #617.