http: code simplification

[catenacyber]

Link to redmine ticket:
https://redmine.openinfosecfoundation.org/issues/5921

Describe changes:

• http: code simplification to avoid one direct usage of htp_list_get

LIBHTP_BRANCH=pr/416

OISF/libhtp#416

Libhtp PR is not a requirement, but is related (code optimizations after release for the same redmine issue)

#10366 with typo in commit fixed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9fe00ff) 82.52% compared to head (587915c) 82.51%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10368      +/-   ##
==========================================
- Coverage   82.52%   82.51%   -0.02%     
==========================================
  Files         978      978              
  Lines      272148   272145       -3     
==========================================
- Hits       224595   224563      -32     
- Misses      47553    47582      +29     

Flag	Coverage Δ
fuzzcorpus	63.59% <100.00%> (-0.01%)	⬇️
suricata-verify	61.85% <85.71%> (-0.03%)	⬇️
unittests	62.83% <71.42%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

[suricata-qa]

Information:

ERROR: QA failed on SURI_TLPW2_autofp_suri_time.

field	baseline	test	%
	SURI_TLPW2_autofp_stats_chk
.uptime	101	111	109.9%
	TREX_GENERIC_stats_chk
.capture.kernel_drops	0	244	0.00

Pipeline 18344

[victorjulien]

Merged in #10413, thanks!