posix: change ftruncate errno for readonly file to EINVAL

[llugin]

Fixing error occuring in LTP test ftruncate03.

---

This change is 

[krzycz]

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

---

Comments from Reviewable

[marcinslusarz]

Please add test case for that in tests/posix/rw/rw.cpp/ftruncate

[codecov[bot]]

Codecov Report

Merging #361 into master will increase coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #361      +/-   ##
==========================================
+ Coverage   79.63%   79.64%   +<.01%     
==========================================
  Files          64       64              
  Lines        7920     7923       +3     
  Branches     1585     1586       +1     
==========================================
+ Hits         6307     6310       +3     
  Misses       1210     1210              
  Partials      403      403

Flag	Coverage Δ
#ltp_tests	46.9% <0%> (+0.1%)	:arrow_up:
#sqlite_tests	45.43% <0%> (-0.12%)	:arrow_down:
#tests_antool	15.34% <0%> (-0.01%)	:arrow_down:
#tests_posix_multi_threaded	25.91% <0%> (-0.04%)	:arrow_down:
#tests_posix_single_threaded	56.26% <100%> (+0.01%)	:arrow_up:
#tests_preload	46.23% <0%> (+0.07%)	:arrow_up:

Impacted Files	Coverage Δ
src/libpmemfile-posix/truncate.c	90.26% <100%> (+0.26%)	:arrow_up:
src/libpmemfile-posix/dir.c	85.01% <0%> (-0.99%)	:arrow_down:
src/libpmemfile-posix/data.c	93.07% <0%> (+0.76%)	:arrow_up:
src/libpmemfile-posix/rename.c	92% <0%> (+0.79%)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update ce57c2b...ae50da8. Read the comment docs.

[sarahjelinek]

---

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

---

Comments from Reviewable

[krzycz]

Coverage: -20%. WTH?

---

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

---

Comments from Reviewable

[GBuella]

Some tests failed. Coverage is reported for failed builds as well? Can we disable that?

[marcinslusarz]

I think it's CodeCov.io bug, so no.

[marcinslusarz]

---

Reviewed 3 of 3 files at r2. Review status: all files reviewed at latest revision, all discussions resolved.

---

Comments from Reviewable