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Switch to recallocarray() for a few operations.  Both growth and shrinkage
are handled safely, and there also is no need for preallocation dances.
Future changes in this area will be less error prone.
Review and one bug found by markus

/* $OpenBSD: xmalloc.h,v 1.17 2017/05/31 09:15:42 deraadt Exp $ */

/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * Created: Mon Mar 20 22:09:17 1995 ylo
 *
 * Versions of malloc and friends that check their results, and never return
 * failure (they call fatal if they encounter an error).
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 */

void	 ssh_malloc_init(void);
void	*xmalloc(size_t);
void	*xcalloc(size_t, size_t);
void	*xreallocarray(void *, size_t, size_t);
void	*xrecallocarray(void *, size_t, size_t, size_t);
char	*xstrdup(const char *);
int	 xasprintf(char **, const char *, ...)
                __attribute__((__format__ (printf, 2, 3)))
                __attribute__((__nonnull__ (2)));