Fix check eip in dual stack

[lou-lan]

Fix #1036

[codecov]

Codecov Report

Merging #1037 (e776ef3) into main (467deb2) will decrease coverage by 0.02%.
Report is 1 commits behind head on main.
The diff coverage is 12.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1037      +/-   ##
==========================================
- Coverage   44.44%   44.43%   -0.02%     
==========================================
  Files          21       21              
  Lines        3260     3261       +1     
==========================================
  Hits         1449     1449              
- Misses       1605     1606       +1     
  Partials      206      206              

Flag	Coverage Δ
unittests	44.43% <12.50%> (-0.02%)	⬇️

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Files	Coverage Δ
pkg/controller/webhook/validate.go	60.00% <12.50%> (-0.22%)	⬇️