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

#2223: reduce compiler warnings from Hydro_RNSID ---------------------------------+-------------------- Reporter: Roland Haas | Type: defect Status: new | Priority: unset Milestone: | Component: Other Version: development version | Keywords: ---------------------------------+-------------------- 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).