rbd: have rbd_get_client() return a rbd_client
Since rbd_get_client() currently returns an error code. It assigns the rbd_client field of the rbd_device structure it is passed if successful. Instead, have it return the created rbd_client structure and return a pointer-coded error if there is an error. This makes the assignment of the client pointer more obvious at the call site. Signed-off-by: NAlex Elder <elder@dreamhost.com> Signed-off-by: NSage Weil <sage@newdream.net>
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