Bug#884177: devscripts: debsnap --list should not complain about existing destdir

[Hilko Bengen]

Package: devscripts
Version: 2.17.11
Severity: normal
User: devscripts at packages.debian.org
Usertags: debsnap
Tags: patch

Dear Maintainers,

After setting DEBSNAP_DESTDIR in my ~/.devscripts configuration file, I
get the following unexpected error:

,----
| $ debsnap --list python-evtx
| debsnap: fatal error at line 255:
| Destination dir /home/bengen/tmp/deb already exists.
| Please (re)move it first, or use --force to overwrite.
`----

I don't see why I should need to use --force for an operation that does
not even modify the destination directory, so I have moved the check
as-is into the $mkDestDir function, see attached patch.

Cheers,
-Hilko
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