fix(arm): fix out of bound in native decoder

[liuq19]

Fix possible dirty data in native decoder

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 51.53%. Comparing base (125ff79) to head (2a6faf2).
Report is 2 commits behind head on main.

Files	Patch %	Lines
internal/decoder/optdec/native.go	75.00%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #676      +/-   ##
==========================================
- Coverage   52.85%   51.53%   -1.33%     
==========================================
  Files         174      128      -46     
  Lines       11470    10732     -738     
==========================================
- Hits         6063     5531     -532     
+ Misses       5071     4881     -190     
+ Partials      336      320      -16     

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