fix: scanAll typo

[ty-dc]

Thanks for contributing!

Notice:

• unite test or E2E test
• do not forget essential code comment and log
• document for the PR
• release note label
  "release/none"
  "release/bug"
  "release/feature"
• read about Contribution notice: https://spidernet-io.github.io/spiderpool/latest/develop/contributing/

What issue(s) does this PR fix:

Fixes #4247

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 81.01%. Comparing base (5179a27) to head (dabd8f9).
Report is 4 commits behind head on release-v0.8.

Files with missing lines	Patch %	Lines
pkg/ip/cidr.go	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-v0.8    #4253      +/-   ##
================================================
- Coverage         81.06%   81.01%   -0.05%     
================================================
  Files                49       49              
  Lines              5418     5420       +2     
================================================
- Hits               4392     4391       -1     
- Misses              864      866       +2     
- Partials            162      163       +1     

Flag	Coverage Δ
unittests	81.01% <25.00%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
pkg/ip/cidr.go	95.23% <25.00%> (-4.77%)	⬇️