message: Remove assigned variable
  Fixes a CI failure
diff: @@ -1579,12 +1579,10 @@ TEST_F(BPWriteReadSpan, BPWriteSpanOperatorException)
  var_r64.AddOperation(
  BZIP2Op, {{adios2::ops::bzip2::key::blockSize100k, "1e-4"}});
  - EXPECT_THROW(adios2::Variable<float>::Span r32Span = bpWriter.Put(
  - var_r32, true, static_cast<float>(step)),
  + EXPECT_THROW(bpWriter.Put(var_r32, true, static_cast<float>(step)),
  std::invalid_argument);
  - EXPECT_THROW(adios2::Variable<double>::Span r64Span = bpWriter.Put(
  - var_r64, true, static_cast<double>(step)),
  + EXPECT_THROW(bpWriter.Put(var_r64, true, static_cast<double>(step)),
  std::invalid_argument);
  bpWriter.EndStep();
  