Simplify some C code by using dedicated functions

[Bisaloo]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 90.47619% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.05%. Comparing base (ce8f5ad) to head (05fbe47).
⚠️ Report is 2 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/H5PL.c	0.00%	2 Missing ⚠️
src/H5.c	91.66%	1 Missing ⚠️
src/h5ls.c	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #206      +/-   ##
==========================================
- Coverage   77.16%   77.05%   -0.12%     
==========================================
  Files          70       70              
  Lines        6464     6411      -53     
==========================================
- Hits         4988     4940      -48     
+ Misses       1476     1471       -5     

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