antool: silence "argument expected" warning

[ldorau]

This change is 

[codecov-io]

Codecov Report

Merging #312 into master will decrease coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #312      +/-   ##
==========================================
- Coverage   78.89%   78.88%   -0.02%     
==========================================
  Files          88       88              
  Lines       13386    13387       +1     
  Branches     1926     1926              
==========================================
- Hits        10561    10560       -1     
- Misses       2129     2130       +1     
- Partials      696      697       +1

Impacted Files	Coverage Δ
src/libpmemfile-posix/rename.c	91.53% <0%> (-0.41%)	:arrow_down:
src/libpmemfile-posix/inode.c	88.49% <0%> (-0.4%)	:arrow_down:
src/libpmemfile-posix/dir.c	81.81% <0%> (-0.25%)	:arrow_down:
src/libpmemfile-posix/read.c	93.91% <0%> (-0.06%)	:arrow_down:
src/libpmemfile-posix/data.c	92.24% <0%> (-0.03%)	:arrow_down:
src/libpmemfile/path_resolve.c	85.16% <0%> (+0.09%)	:arrow_up:
src/libpmemfile-posix/ctree.c	51.33% <0%> (+0.26%)	:arrow_up:
src/libpmemfile-posix/file.c	66.48% <0%> (+0.36%)	:arrow_up:

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[krzycz]

Reviewed 2 of 2 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

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