Fixed lifetime issue of startup mutex and condition variable in PfRingDevice.

[Dimi1010]

Minimal viable fix of #1664 based on #1668.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.15%. Comparing base (7898a5d) to head (38b956b).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1679      +/-   ##
==========================================
- Coverage   83.16%   83.15%   -0.01%     
==========================================
  Files         277      277              
  Lines       48201    48200       -1     
  Branches     9932     9974      +42     
==========================================
- Hits        40086    40082       -4     
+ Misses       7266     7240      -26     
- Partials      849      878      +29     

Flag	Coverage Δ
alpine320	75.15% <ø> (ø)
fedora40	75.17% <ø> (+<0.01%)	⬆️
macos-13	80.65% <ø> (ø)
macos-14	80.65% <ø> (-0.01%)	⬇️
macos-15	80.63% <ø> (ø)
mingw32	70.87% <ø> (-0.05%)	⬇️
mingw64	70.86% <ø> (-0.03%)	⬇️
npcap	85.23% <ø> (-0.09%)	⬇️
rhel94	75.03% <ø> (ø)
ubuntu2004	58.63% <ø> (+<0.01%)	⬆️
ubuntu2004-zstd	58.74% <ø> (+0.01%)	⬆️
ubuntu2204	74.97% <ø> (+<0.01%)	⬆️
ubuntu2204-icpx	61.40% <ø> (-0.04%)	⬇️
ubuntu2404	75.20% <ø> (-0.02%)	⬇️
unittest	83.15% <ø> (-0.01%)	⬇️
windows-2019	85.33% <ø> (-0.01%)	⬇️
windows-2022	85.36% <ø> (-0.01%)	⬇️
winpcap	85.33% <ø> (ø)
xdp	50.53% <ø> (ø)

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