Fix compile warning from CUDF_FUNC_RANGE in a member function

[davidwendt]

Description

Compile warning was introduced in #11652 in bgzip_data_chunk_source.cu. The warning can be seen here https://gpuci.gpuopenanalytics.com/job/rapidsai/job/gpuci/job/cudf/job/prb/job/cudf-cpu-cuda-build/CUDA=11.5/12417/consoleFull (search for 177-D)

/cudf/cpp/src/io/text/bgzip_data_chunk_source.cu(362): warning #177-D: variable "nvtx3_range__" was declared but never referenced

The nvtx3_range__ is part of the CUDF_FUNC_RANGE() macro. The warning is incorrect and likely a compiler bug. The workaround in this PR is to add [[maybe_unused]] to the variable declaration.

I was not able to create a small reproducer for compile bug filing.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[upsj]

Thanks for fixing this! I wasn't familiar enough with C++ attributes to do it myself ;)

[codecov]

Codecov Report

Base: 87.40% // Head: 87.52% // Increases project coverage by +0.11% 🎉

Coverage data is based on head (3fa0e50) compared to base (f72c4ce).
Patch has no changes to coverable lines.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-22.12   #11798      +/-   ##
================================================
+ Coverage         87.40%   87.52%   +0.11%     
================================================
  Files               133      133              
  Lines             21833    21801      -32     
================================================
- Hits              19084    19081       -3     
+ Misses             2749     2720      -29     

Impacted Files	Coverage Δ
python/dask_cudf/dask_cudf/sorting.py	93.29% <0.00%> (+2.11%)	⬆️
...thon/dask_cudf/dask_cudf/tests/test_distributed.py	18.86% <0.00%> (+4.94%)	⬆️

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[davidwendt]

@gpucibot merge