fix full allocation failure on APFS

[arvidn]

No description provided.

[codecov-io]

Codecov Report

Merging #2450 into RC_1_1 will increase coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           RC_1_1    #2450      +/-   ##
==========================================
+ Coverage   66.44%   66.58%   +0.13%     
==========================================
  Files         375      375              
  Lines       60856    60856              
  Branches     9703     9703              
==========================================
+ Hits        40434    40518      +84     
+ Misses      15997    15914      -83     
+ Partials     4425     4424       -1

Impacted Files	Coverage Δ
src/file.cpp	73% <ø> (ø)	⬆️
src/timestamp_history.cpp	64.28% <0%> (-3.58%)	⬇️
src/http_seed_connection.cpp	51.58% <0%> (-1.81%)	⬇️
src/utp_stream.cpp	73.84% <0%> (-1.69%)	⬇️
src/kademlia/routing_table.cpp	62.55% <0%> (-1.11%)	⬇️
src/storage.cpp	60.73% <0%> (-0.37%)	⬇️
src/mpi.cpp	15.24% <0%> (-0.08%)	⬇️
include/libtorrent/utp_stream.hpp	43.13% <0%> (ø)	⬆️
src/piece_picker.cpp	89.26% <0%> (+0.13%)	⬆️
src/disk_io_thread.cpp	65.66% <0%> (+0.31%)	⬆️
... and 13 more

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