kernel: Let GetCachedFilename use ELM_PLIST

[fingolfin]

helps clang static analyzer understand the code

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.98%. Comparing base (676342d) to head (308845b).
⚠️ Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
src/io.c	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6546      +/-   ##
==========================================
- Coverage   79.02%   78.98%   -0.05%     
==========================================
  Files         685      683       -2     
  Lines      294329   294104     -225     
  Branches     8647     8631      -16     
==========================================
- Hits       232601   232305     -296     
- Misses      59922    59992      +70     
- Partials     1806     1807       +1     

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