Bug#889956: dhex: segfault on save failure

[Peter Gervai]

Package: dhex
Version: 0.68-2+b2
Severity: minor

dhex crashes when file IO returns any error, smells like complete
lack of error handling.

Steps to reproduce:
echo oh-well > foo
chmod a-w foo
dhex foo
 .. edit
 .. try to save
segfault