Return the uncompressed size for originally-compressed layers in GetBlob
Return the uncompressed size for originally-compressed layers in GetBlob

GetBlob itself returns the uncompressed version of the layer data
(and LayerInfosForCopy has already set up the caller to expect
uncompressed sizes).

Signed-off-by: Miloslav Trmač <9c008e38982a5397deb855345fb164f0558459ae@redhat.com>

containers/image,containers/image