[ET Trac] #2702: Cactus: CCTK_ParameterWalk: Avoid uninitialized variable

[Erik Schnetter]

#2702: Cactus: CCTK_ParameterWalk: Avoid uninitialized variable

 Reporter: Erik Schnetter
   Status: new
Milestone: 
  Version: 
     Type: bug
 Priority: major
Component: Cactus

Ensure \`next\_index\` is re-initialized every time.

Otherwise there is a code path where `CCTK_ParameterWalk` is called with `first=1`, where `next_index` is not reset to `0` before it is used.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2702/cactus-cctk_parameterwalk-avoid
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