I upgraded successfully from 9.7.1.0.30 to the 9.8 GA successfully in a lab environment, but would not suggest doing so in production without Ruckus approval. It may be worth opening a support case to verify, as they will likely know more.
Our 9.8.0.0.369 GA has been posted to our Website today, with Release Notes to follow that will provide the official upgrade version path, but Yes, you can upgrade from 9.7.1.0.30 to 9.8.0.0.369 in one procedure.