Potential fix for code scanning alert no. 5680: Unused local variable

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: bigfooted

TestCases/py_wrapper/custom_source_buoyancy/run.py

@@ -59,7 +59,7 @@ def main():
   # all the indices and the map to the names of the primitives
   primindex = driver.GetPrimitiveIndices()
 
-  nVars = driver.GetNumberSolverVars(iSOLVER)
+
   varindex = primindex.copy()
   #for prim in varindex.copy():
   #  if varindex[prim] >=nVars: