Random set of clang-tidy fixes

[RainerKuemmerle]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 53.38983% with 55 lines in your changes missing coverage. Please review.

Project coverage is 65.71%. Comparing base (5fda0e4) to head (8187ac6).
Report is 6 commits behind head on pymem.

Files with missing lines	Patch %	Lines
g2o/core/block_solver.h	0.00%	16 Missing ⚠️
g2o/core/optimization_algorithm_dogleg.cpp	35.29%	11 Missing ⚠️
g2o/core/base_variable_sized_edge.h	72.72%	4 Missing and 2 partials ⚠️
g2o/types/slam3d_addons/plane3d.h	0.00%	5 Missing ⚠️
g2o/core/optimizable_graph.cpp	73.33%	4 Missing ⚠️
g2o/core/sparse_optimizer.cpp	40.00%	3 Missing ⚠️
g2o/solvers/csparse/csparse_helper.cpp	0.00%	3 Missing ⚠️
g2o/core/estimate_propagator.cpp	50.00%	2 Missing ⚠️
g2o/core/sparse_block_matrix.h	85.71%	1 Missing ⚠️
g2o/core/sparse_block_matrix_diagonal.h	0.00%	1 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##            pymem     #850      +/-   ##
==========================================
- Coverage   65.72%   65.71%   -0.02%     
==========================================
  Files         342      342              
  Lines       13410    13401       -9     
  Branches     1319     1319              
==========================================
- Hits         8814     8806       -8     
- Misses       4207     4208       +1     
+ Partials      389      387       -2     

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