dmg: fix reading of uncompressed chunks
When dmg_read_chunk encounters an uncompressed chunk it currently calls read without any previous adjustment of the file postion. This seems very wrong, and the "reference" implementation in dmg2img does a search to the same offset as done in the various compression cases, so do the same here. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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