Problem: memory leak during memiavl import

[yihuang]

Solution:

• break up the unnesserary references

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PR Checklist:

• Have you read the CONTRIBUTING.md?
• Does your PR follow the C4 patch requirements?
• Have you rebased your work on top of the latest master?
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• Have you included tests for any non-trivial functionality?
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Thank you for your code, it's appreciated! :)

[codecov]

Codecov Report

Merging #1036 (e5ac639) into main (de7e559) will increase coverage by 23.96%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main    #1036       +/-   ##
===========================================
+ Coverage   22.43%   46.39%   +23.96%     
===========================================
  Files          50       82       +32     
  Lines        3013     6955     +3942     
===========================================
+ Hits          676     3227     +2551     
- Misses       2272     3393     +1121     
- Partials       65      335      +270     

Impacted Files	Coverage Δ
memiavl/import.go	65.40% <100.00%> (ø)

... and 46 files with indirect coverage changes