fix tar LongNames test or impl

[piksel]

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[codecov[bot]]

Codecov Report

Merging #814 (4fa790d) into master (68e2f92) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #814   +/-   ##
=======================================
  Coverage   74.78%   74.78%           
=======================================
  Files          72       72           
  Lines        8535     8535           
=======================================
  Hits         6383     6383           
  Misses       2152     2152           

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