[Pkg-mutt-maintainers] Bug#855424: mutt: don't check errno if read/write didn't error

[jl.debbugtrac at gmail.com]

To confirm, with mutt and imap, I also receive the error message:

> Error talking to localhost (Interrupted system call)

I am running an up-to-date Debian Stretch (NeoMutt 20170113 (1.7.2)).