Show hashes calculated by main thread in error messages

The main thread calculates the hash sums if the method hasn't to be able
to verify the files, but while a failure is detected and reported, the
error messages did not include the hash sums which looks at least
puzzling.

So to have a complete error message we ensure that the hashes we
calculated are appended to the message from the method so that it looks
for the higher level code as if the method had calculated the hashes.

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