[ET Trac] [Einstein Toolkit] #2223: reduce compiler warnings from Hydro_RNSID

[Einstein Toolkit]

#2223: reduce compiler warnings from Hydro_RNSID
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 Reporter:  Roland Haas          |       Type:  defect
   Status:  new                  |   Priority:  unset
Milestone:                       |  Component:  Other
  Version:  development version  |   Keywords:
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 This is mostly just removing some variable declarations. However I also
 turned a while loop into a do..while loop (the code already assumed that
 the while loop would loop at least once).

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/2223>
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