source/kernel: silence misleading error on selinux detection

[marquiz]

Silence a irrelevant error that was printed in case /sys/fs/selinux/ directory exists but selinuxfs is not mounted (i.e. the dir is empty).

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[marquiz]

/assign @PiotrProkop

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ArangoGutierrez, marquiz

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[PiotrProkop]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 70af8e249072e6c79408dbf33f577b9993c9618f

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 39.88%. Comparing base (c2e3de6) to head (ce66121). Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1694      +/-   ##
==========================================
+ Coverage   39.84%   39.88%   +0.04%     
==========================================
  Files          80       80              
  Lines        6841     6839       -2     
==========================================
+ Hits         2726     2728       +2     
+ Misses       3861     3856       -5     
- Partials      254      255       +1     

Files	Coverage Δ
source/kernel/selinux.go	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes