[sfbis] Ban "%00" in serialized DisplayString

A current security issue has reminded me how bad an idea it is to
have NUL bytes in the middle of strings in C/POSIX enviroments so
I have opened a ticket which proposes to ban %00 from serialized
DisplayString in order to prevent it:

	https://github.com/httpwg/http-extensions/issues/2615

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Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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Received on Thursday, 17 August 2023 05:26:48 UTC