Doesn't detect error when reading from write-only file

[Nikratio]

As said in issue #72, it seems that sshfs fails to notice problems when reading from a file that was opened write-only. According to https://lists.mindrot.org/pipermail/openssh-unix-dev/2017-August/036171.html, the OpenSSH server seems to correctly send the error.

We should look into that.

[matthewcurry]

Does commit d193b1 "fix" this issue as well?

[Nikratio]

That commit doesn't exist on my system. In case you refer to the remval of writeback caching: no. That feature exposed the problem, but did not cause it.