cleanup: make it more clear that assert and uint32_t increment both only exist if NDEBUG is not defined

[zoff99]

This change is 

[codecov]

Codecov Report

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (d0304d8) 74.47% compared to head (a1d5518) 74.46%.
Report is 2 commits behind head on master.

❗ Current head a1d5518 differs from pull request most recent head d01c116. Consider uploading reports for the commit d01c116 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2311      +/-   ##
==========================================
- Coverage   74.47%   74.46%   -0.02%     
==========================================
  Files          87       87              
  Lines       26189    26211      +22     
==========================================
+ Hits        19505    19517      +12     
- Misses       6684     6694      +10     

Files	Coverage Δ
toxcore/DHT.c	84.62% <ø> (-0.15%)	⬇️
toxcore/events/friend_connection_status.c	82.14% <100.00%> (ø)
toxcore/events/friend_message.c	81.73% <100.00%> (ø)
toxcore/events/friend_name.c	76.84% <100.00%> (ø)
toxcore/events/friend_status.c	81.92% <100.00%> (ø)
toxcore/events/friend_status_message.c	77.08% <100.00%> (ø)
toxcore/events/friend_typing.c	81.92% <100.00%> (ø)
toxcore/network.c	86.21% <100.00%> (+0.12%)	⬆️
toxcore/bin_unpack.c	78.43% <91.66%> (+1.01%)	⬆️
toxcore/events/conference_invite.c	14.42% <0.00%> (ø)
... and 15 more

... and 7 files with indirect coverage changes

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[iphydf]

Reviewed 1 of 1 files at r1.
Reviewable status: complete! 1 of 1 approvals obtained