Fix experimental filesystem header

[MisterTea]

Fixes #590

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.06% 🎉

Comparison is base (e96ce27) 72.97% compared to head (8e4da10) 73.04%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #596      +/-   ##
==========================================
+ Coverage   72.97%   73.04%   +0.06%     
==========================================
  Files          50       50              
  Lines        3042     3042              
==========================================
+ Hits         2220     2222       +2     
+ Misses        822      820       -2     

Files Changed	Coverage Δ
test/ServerFifoPathTest.cpp	94.24% <ø> (ø)

... and 5 files with indirect coverage changes

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