rbd: adjust image object request ref counting
An extra reference is taken when an object request is added as one of the requests making up an image object. A reference is dropped again when the image's object requests get submitted. The original reference for the object request will remain throughout this period, so we don't need to add and then take away an extra one. This can be interpreted as the image request inheriting the original object request's reference. Signed-off-by: NAlex Elder <elder@inktank.com> Reviewed-by: NJosh Durgin <josh.durgin@inktank.com>
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