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: Alex Elder <elder@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>
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