Update native.py

[T3pp31]

Checklist:

• If you are new to Scapy: I have checked CONTRIBUTING.md (esp. section submitting-pull-requests)
• I squashed commits belonging together
• I added unit tests or explained why they are not relevant
• I executed the regression tests (using cd test && ./run_tests or tox)
• If the PR is still not finished, please create a Draft Pull Request

i fixed issue#4795
Modify the L3WinSocket.close() method to check for the existence of the self.ins attribute before accessing it.

fixes #4795

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.98%. Comparing base (d6a25bb) to head (5b1c175).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4820   +/-   ##
=======================================
  Coverage   80.98%   80.98%           
=======================================
  Files         365      365           
  Lines       89112    89112           
=======================================
+ Hits        72167    72171    +4     
+ Misses      16945    16941    -4     

Files with missing lines	Coverage Δ
scapy/arch/windows/native.py	68.46% <100.00%> (ø)

... and 8 files with indirect coverage changes

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[gpotter2]

Thanks for the PR !