bug#30005: 27.0.50; call-interactively doesn't work correctly if the interactive specification has an embedded null byte

[Philipp <p.stephani2@gmail.com>]

For example, when evaluating

(call-interactively (lambda (a b) (interactive "sa\0b\ns")))

the prompt is only "a" and a `wrong-number-of-argument' signal is
raised.  This is because `call-interactively' copies the interactive
specification to a C string, ignoring embedded nulls.


In GNU Emacs 27.0.50 (build 4, x86_64-apple-darwin17.3.0, NS appkit-1561.20 Version 10.13.2 (Build 17C88))
 of 2018-01-02 built on p
Repository revision: 1330afd3debc5a0d5d7d58a5db3f73f84b04be26
Windowing system distributor 'Apple', version 10.3.1561
System Description:  Mac OS X 10.13.2

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured features:
NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS JSON

Important settings:
  value of $LANG: de_DE.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

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Load-path shadows:
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Memory information:
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 (symbols 48 20150 1)
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 (strings 32 28872 1694)
 (string-bytes 1 770691)
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