GameList: Fix crash if cache fails to open

src/common/binary_reader_writer.cpp

@@ -289,7 +289,7 @@ BinaryFileReader& BinaryFileReader::operator=(BinaryFileReader&& move)
 
 bool BinaryFileReader::IsAtEnd()
 {
-  return (FileSystem::FTell64(m_fp) == m_size);
+  return (!m_fp || FileSystem::FTell64(m_fp) == m_size);
 }
 
 bool BinaryFileReader::ReadCString(std::string* dst)

src/core/game_list.cpp

@@ -495,6 +495,8 @@ bool GameList::LoadOrInitializeCache(std::FILE* fp, bool invalidate_cache)
 
   WARNING_LOG("Initializing game list cache.");
   s_cache_map.clear();
+  if (!fp)
+    return false;
 
   // Truncate file, and re-write header.
   Error error;