Jeff Epler 8c841af946 MP3File: Avoid crash in get_buffer when deinitted
When a playing mp3 is deinitted, it's possible to reach get_buffer,
but all the internal pointers are NULL.  This would lead to a hard fault.
Avoid it by returning GET_BUFFER_ERROR instead.
2019-12-11 22:04:10 -06:00
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