mount: fix upgrade with xattr

[davies]

close #4447

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 55.38%. Comparing base (96bebe7) to head (fbaa923).

Files	Patch %	Lines
cmd/mount_unix.go	0.00%	3 Missing ⚠️
cmd/passfd.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4450      +/-   ##
==========================================
+ Coverage   55.32%   55.38%   +0.05%     
==========================================
  Files         157      157              
  Lines       41112    41112              
==========================================
+ Hits        22746    22769      +23     
+ Misses      15837    15816      -21     
+ Partials     2529     2527       -2     

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