fix: assert in api should not be a pointer

[eddycharly]

Explanation

Assert in api should not be a pointer.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 23.18%. Comparing base (137c2d1) to head (16c106a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/apis/policy/v1alpha1/zz_generated.deepcopy.go	0.00%	1 Missing ⚠️
pkg/matching/match.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #488      +/-   ##
==========================================
+ Coverage   23.16%   23.18%   +0.02%     
==========================================
  Files          86       86              
  Lines        4062     4058       -4     
==========================================
  Hits          941      941              
+ Misses       3036     3032       -4     
  Partials       85       85              

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