posix: lseek fixes

[marcinslusarz]

This change is 

[krzycz]

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Reviewed 1 of 1 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[codecov[bot]]

Codecov Report

Merging #384 into master will increase coverage by 0.01%. The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #384      +/-   ##
==========================================
+ Coverage   76.91%   76.93%   +0.01%     
==========================================
  Files          67       67              
  Lines        8261     8262       +1     
  Branches     1658     1658              
==========================================
+ Hits         6354     6356       +2     
  Misses       1489     1489              
+ Partials      418      417       -1

Flag	Coverage Δ
#ltp_tests	45.67% <0%> (-0.01%)	:arrow_down:
#sqlite_tests	45.18% <0%> (-0.08%)	:arrow_down:
#tests_antool	14.71% <0%> (-0.01%)	:arrow_down:
#tests_posix_multi_threaded	25.08% <0%> (ø)	:arrow_up:
#tests_posix_single_threaded	54.32% <75%> (ø)	:arrow_up:
#tests_preload	45.09% <0%> (+0.29%)	:arrow_up:

Impacted Files	Coverage Δ
src/libpmemfile-posix/lseek.c	84.66% <75%> (+0.1%)	:arrow_up:
src/libpmemfile-posix/dir.c	85.25% <0%> (+0.24%)	:arrow_up:

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[sarahjelinek]

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Reviewed 1 of 1 files at r1. Review status: all files reviewed at latest revision, all discussions resolved, some commit checks failed.

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Comments from Reviewable