Use this function to read a byte from an SDL_IOStream.
This function will return false when the data stream is completely read,
and SDL_GetIOStatus() will return SDL_IO_STATUS_EOF. If false is returned
and the stream is not at EOF, SDL_GetIOStatus() will return a different
error value and SDL_GetError() will offer a human-readable message.
Use this function to read a byte from an SDL_IOStream.
This function will return false when the data stream is completely read, and SDL_GetIOStatus() will return SDL_IO_STATUS_EOF. If false is returned and the stream is not at EOF, SDL_GetIOStatus() will return a different error value and SDL_GetError() will offer a human-readable message.