Check for errors on descfile extraction

If /tmp was full during the early stages of package extraction, we were
unable to extract the package description file with the call to
archive_read_data_into_fd(archive, fd) becuase we never checked the return
code. Add a check to ensure the extraction was successful and print and
return an error if it was not instead of falling through to a possibly
untrue error message.

This should fix FS #8885.

Signed-off-by: Dan McGee <dan@archlinux.org>

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