fix gateway print log panic

[zmberg]

Ⅰ. Describe what this PR does

[sonatype-lift]

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[codecov-commenter]

Codecov Report

Merging #167 (dfbfa1f) into master (2986258) will not change coverage.
The diff coverage is 0.00%.

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@@           Coverage Diff           @@
##           master     #167   +/-   ##
=======================================
  Coverage   43.34%   43.34%           
=======================================
  Files          50       50           
  Lines        5373     5373           
=======================================
  Hits         2329     2329           
  Misses       2647     2647           
  Partials      397      397           

Flag	Coverage Δ
unittests	43.34% <0.00%> (ø)

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Files Changed	Coverage Δ
pkg/trafficrouting/network/gateway/gateway.go	54.26% <0.00%> (ø)

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[veophi]

/lgtm

[veophi]

/approve

[zmberg]

/approve

[kruise-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: veophi, zmberg

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