further refinement to internal get_gateway function

[arvidn]

causing issues for certain network setups

[codecov-io]

Codecov Report

Merging #4331 into RC_1_2 will decrease coverage by 0.11%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           RC_1_2    #4331      +/-   ##
==========================================
- Coverage   74.73%   74.61%   -0.12%     
==========================================
  Files         440      440              
  Lines       60780    60775       -5     
  Branches     8973     8973              
==========================================
- Hits        45421    45348      -73     
- Misses      10870    10944      +74     
+ Partials     4489     4483       -6

Impacted Files	Coverage Δ
src/enum_net.cpp	75.51% <ø> (+2.92%)	⬆️
test/test_enum_net.cpp	95.08% <100%> (-0.16%)	⬇️
src/utp_stream.cpp	67.59% <0%> (-7.96%)	⬇️
src/packet_buffer.cpp	75.3% <0%> (-4.94%)	⬇️
src/http_tracker_connection.cpp	63.32% <0%> (-1.55%)	⬇️
src/ip_voter.cpp	80.59% <0%> (-1.5%)	⬇️
test/test_ed25519.cpp	97.26% <0%> (-1.37%)	⬇️
src/close_reason.cpp	18.88% <0%> (-1.12%)	⬇️
src/string_util.cpp	90.8% <0%> (-0.58%)	⬇️
src/peer_list.cpp	69.49% <0%> (-0.48%)	⬇️
... and 23 more

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