demux_mkv: factor block reading

The code for reading block data was duplicated. Move it into a function.

Instead of returning on error (possibly due to corrupt data) and
signalling EOF, continue by trying to find the next block. This makes
error handling slightly simpler too, because you don't have to care
about freeing the current block. We could still signal EOF in this case,
but trying to resync sounds better for dealing with corrupted files.

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