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nvdisc.c: Fix crash after an error or signal in discipline function (#…
…356) This patch fixes the crashes experienced when a discipline function exited because of a signal or an error from a special builtin. The crashes were caused by ksh entering an inconsistent state after performing a longjmp away from the assign() and lookup() functions in nvdisc.c. Fixing the crash requires entering a new context, then setting a nonlocal goto with sigsetjmp(3). Any longjmps that happen while running the discipline function will go back to assign/lookup, allowing ksh to do a proper cleanup afterwards. Resolves: #346
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