Improve closing the TLS connection

If gnutls_session_bye() exited with an error, we never closed
the underlying file descriptor, causing the method to think the
connection was still open. This caused problems especially in
test-partial-file-support where we checked that a "complete"
file and an incomplete file work. The first GET returns a 416
with Connection: close, and the next GET request then accidentally
reads the body of the 416 as the header for its own request.

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