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xfree is not particularly helpful, remove it. From Thomas Adam.

/* $OpenBSD: xmalloc.c,v 1.4 2012/07/10 11:53:01 nicm Exp $ */

/*
 * Copyright (c) 2004 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/param.h>

#include <errno.h>
#include <libgen.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include "tmux.h"

char *
xstrdup(const char *s)
{
	char	*ptr;
	size_t	 len;

	len = strlen(s) + 1;
	ptr = xmalloc(len);

	strlcpy(ptr, s, len);
	return (ptr);
}

void *
xcalloc(size_t nmemb, size_t size)
{
	void	*ptr;

	if (size == 0 || nmemb == 0)
		fatalx("zero size");
	if (SIZE_MAX / nmemb < size)
		fatalx("nmemb * size > SIZE_MAX");
	if ((ptr = calloc(nmemb, size)) == NULL)
		fatal("xcalloc failed");

	return (ptr);
}

void *
xmalloc(size_t size)
{
	void	*ptr;

	if (size == 0)
		fatalx("zero size");
	if ((ptr = malloc(size)) == NULL)
		fatal("xmalloc failed");

	return (ptr);
}

void *
xrealloc(void *oldptr, size_t nmemb, size_t size)
{
	size_t	 newsize = nmemb * size;
	void	*newptr;

	if (newsize == 0)
		fatalx("zero size");
	if (SIZE_MAX / nmemb < size)
		fatalx("nmemb * size > SIZE_MAX");
	if ((newptr = realloc(oldptr, newsize)) == NULL)
		fatal("xrealloc failed");

	return (newptr);
}

int printflike2
xasprintf(char **ret, const char *fmt, ...)
{
	va_list ap;
	int	i;

	va_start(ap, fmt);
	i = xvasprintf(ret, fmt, ap);
	va_end(ap);

	return (i);
}

int
xvasprintf(char **ret, const char *fmt, va_list ap)
{
	int	i;

	i = vasprintf(ret, fmt, ap);
	if (i < 0 || *ret == NULL)
		fatal("xvasprintf failed");

	return (i);
}

int printflike3
xsnprintf(char *buf, size_t len, const char *fmt, ...)
{
	va_list ap;
	int	i;

	va_start(ap, fmt);
	i = xvsnprintf(buf, len, fmt, ap);
	va_end(ap);

	return (i);
}

int
xvsnprintf(char *buf, size_t len, const char *fmt, va_list ap)
{
	int	i;

	if (len > INT_MAX)
		fatalx("len > INT_MAX");

	i = vsnprintf(buf, len, fmt, ap);
	if (i < 0)
		fatal("vsnprintf failed");

	return (i);
}