Fix a bunch of warnings, issued by GCC.

[ni4]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.27%. Comparing base (9fd1893) to head (368595d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2196   +/-   ##
=======================================
  Coverage   77.26%   77.27%           
=======================================
  Files         194      194           
  Lines       37751    37770   +19     
=======================================
+ Hits        29170    29186   +16     
- Misses       8581     8584    +3     

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