fix issue in udp_socket with unusual socket failure

[arvidn]

No description provided.

[codecov-io]

Codecov Report

Merging #3312 into RC_1_1 will decrease coverage by 0.06%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           RC_1_1   #3312      +/-   ##
=========================================
- Coverage   66.47%   66.4%   -0.07%     
=========================================
  Files         376     376              
  Lines       61405   61407       +2     
  Branches     9749    9749              
=========================================
- Hits        40819   40779      -40     
- Misses      16135   16155      +20     
- Partials     4451    4473      +22

Impacted Files	Coverage Δ
src/udp_socket.cpp	47.7% <0%> (-0.14%)	⬇️
include/libtorrent/utp_socket_manager.hpp	56.25% <0%> (-25%)	⬇️
src/utp_stream.cpp	64.93% <0%> (-8.64%)	⬇️
src/packet_buffer.cpp	80.24% <0%> (-7.41%)	⬇️
src/timestamp_history.cpp	64.28% <0%> (-3.58%)	⬇️
src/ip_voter.cpp	78.78% <0%> (-1.52%)	⬇️
test/web_seed_suite.cpp	90.45% <0%> (-1.51%)	⬇️
src/storage.cpp	61.59% <0%> (-1.31%)	⬇️
src/kademlia/dht_tracker.cpp	58.33% <0%> (-1.29%)	⬇️
src/utp_socket_manager.cpp	64.77% <0%> (-1.14%)	⬇️
... and 25 more

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