Safe cookie authentication failure replies do not end with a CRLF

On the control socket, AUTHCHALLENGE's failure replies do not end with a CRLF.

+12:29% nc localhost 9100
AUTHCHALLENGE SAFEOHJOIE
513 AUTHCHALLENGE only supports SAFECOOKIE authentication%

+1:43% nc localhost 9100
AUTHCHALLENGE SAFECOOKIE FOOFA
513 Invalid base16 client nonce%

That is all.

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