fix: mem guard

[funnydreamwinz]

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What this PR does / why we need it:

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.52%. Comparing base (89a8d81) to head (31708f7).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...in/qosaware/resource/memory/plugin/memory_guard.go	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1058      +/-   ##
==========================================
- Coverage   60.53%   60.52%   -0.02%     
==========================================
  Files         700      700              
  Lines       66674    66683       +9     
==========================================
- Hits        40360    40357       -3     
- Misses      21759    21767       +8     
- Partials     4555     4559       +4     

Flag	Coverage Δ
unittest	60.52% <81.81%> (-0.02%)	⬇️

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