vendor.sh: error out if nuking failed

We already have code to handle this, but it's possible
that I might break it in the future, due to the complex
logic of this script.

So, I've implemented this catch-all check at the end of
the process. It still relies on the actual setting of
the variables, upon which this check is based, to be set
correctly.

This condition will most certainly never be met, unless
I break some other part of the code in the future. That
is precisely what this overly pedantic check is for.

Example scenarios:

I forget to set xchanged=y, on a new modification.

I set has_hashes erroneously.

The variables are re-used between runs, and not properly
reset; at present, a given run of ./mk inject only
operates on a single target, but this latter fact could
change in the future.

need_files is set erroneously; vendorfiles detected as
being required, when they aren't.

These are just a few examples. As such, this is a preventative
bug fix, because it's preventing a bug.

The main reason I want this i n here is because I need to ensure
that vendor files are properly deleted, for a given release.
If I accidentally includes ones that I'm not supposed to,
inside ROM images, that could be a big problem.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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