qcow2: refactor decompress_buffer
- make it look more like a pair of qcow2_compress - rename the function and its parameters - drop extra out_len variable, check filling of output buffer by strm structure itself - fix code style - add some documentation Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: NAlberto Garcia <berto@igalia.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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