nfs: fix clippy errors (backport 8)

[glongo]

Describe changes:

• Fix clippy errors

[jasonish]

Interesting, main is 1.98.1 clippy clean, but not 1.85.0 clippy clean.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.67%. Comparing base (d681600) to head (913715c).

Additional details and impacted files

@@              Coverage Diff               @@
##           main-8.0.x   #16212      +/-   ##
==============================================
- Coverage       81.67%   81.67%   -0.01%     
==============================================
  Files            1020     1020              
  Lines          281500   281500              
==============================================
- Hits           229915   229905      -10     
- Misses          51585    51595      +10     

Flag	Coverage Δ
fuzzcorpus	63.55% <66.66%> (ø)
livemode	18.42% <0.00%> (-0.04%)	⬇️
netns	19.90% <0.00%> (-0.02%)	⬇️
pcap	44.21% <0.00%> (-0.02%)	⬇️
suricata-verify	65.05% <0.00%> (-0.03%)	⬇️
unittests	58.64% <50.00%> (-0.01%)	⬇️

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[suricata-qa]

Information: QA ran without warnings.

Pipeline = 34287

[victorjulien]

Merged in #16236, thanks!