Merge libedit fixes from NetBSD
Add trailing NULL's to the varargs functions as required.
(John Spencer)
readline.c r1.106
Bounds search for reallocated index, from OpenBSD via Andreas Fett
map.c 1.34
map.h 1.10
parse.c 1.27
read.c 1.71
This is a direct commit to stable/10 as these changes are included in a
broader sync with NetBSD committed by bapt@ in r276881.
Reviewed by: bapt
Differential Revision: https://reviews.freebsd.org/D1728
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