Fix default argument for following symlinks in JFFS

[Schamper]

Fixes #924

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.02%. Comparing base (2deded6) to head (30c7319).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #925   +/-   ##
=======================================
  Coverage   77.01%   77.02%           
=======================================
  Files         322      322           
  Lines       27566    27566           
=======================================
+ Hits        21231    21232    +1     
+ Misses       6335     6334    -1     

Flag	Coverage Δ
unittests	77.02% <100.00%> (+<0.01%)	⬆️

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