fix: close dst file

[testwill]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:
/kind bug
/kind documentation
/kind enhancement
/kind good-first-issue
/kind feature
/kind question
/kind design
/sig ai
/sig iot
/sig network
/sig storage

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

other Note

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.37%. Comparing base (37addb5) to head (61b3d9f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2046   +/-   ##
=======================================
  Coverage   55.37%   55.37%           
=======================================
  Files         185      185           
  Lines       17821    17821           
=======================================
  Hits         9869     9869           
  Misses       6934     6934           
  Partials     1018     1018           

Flag	Coverage Δ
unittests	55.37% <ø> (ø)

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[rambohe-ch]

/lgtm