backup-files: Quick exit when unlinking is not needed

The "check for hard links" use case is almost always a no-op. Check
if any work is needed at all first, and only if this is the case,
walk the list of files and unlink the faulty files. This approach
results in a huge performance gain in the most common case, and a
very small performance loss in the uncommon case.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Raphael Hertzog <hertzog@debian.org>

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