block: rbd: removing unnecessary test
rbd_get_segment() can't return a negative value, we don't need to check
the return output.
Signed-off-by: NYehuda Sadeh <yehuda@hq.newdream.net>
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rbd_get_segment() can't return a negative value, we don't need to check
the return output.
Signed-off-by: NYehuda Sadeh <yehuda@hq.newdream.net>