fix "expression result unused" warnings

[njzjz]

See https://en.cppreference.com/w/cpp/error/assert, which shows several ways to avoid unused warnings.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (fbaf96b) 75.19% compared to head (6860383) 75.36%.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #2910      +/-   ##
==========================================
+ Coverage   75.19%   75.36%   +0.17%     
==========================================
  Files         220      245      +25     
  Lines       20222    24635    +4413     
  Branches      902     1581     +679     
==========================================
+ Hits        15205    18566    +3361     
- Misses       4485     5139     +654     
- Partials      532      930     +398     

Files	Coverage Δ
source/api_cc/src/DataModifier.cc	78.66% <ø> (ø)
source/api_cc/src/DeepTensor.cc	78.62% <ø> (ø)
source/lib/include/ComputeDescriptor.h	79.14% <ø> (-0.86%)	⬇️
source/lmp/fix_dplr.cpp	75.18% <ø> (ø)
source/api_cc/src/common.cc	78.36% <0.00%> (ø)

... and 58 files with indirect coverage changes

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