[RFC PATCH] vsnprintf: Remove use of %n and convert existing uses

[Tetsuo Handa]

Joe Perches wrote:
> -	seq_printf(m, "%s%d%n", con->name, con->index, &len);
> +	len = seq_printf(m, "%s%d", con->name, con->index);

Isn't len always 0 or -1 ?

int seq_vprintf(struct seq_file *m, const char *f, va_list args)
{
	int len;

	if (m->count < m->size) {
		len = vsnprintf(m->buf + m->count, m->size - m->count, f, args);
		if (m->count + len < m->size) {
			m->count += len;
			return 0;
		}
	}
	seq_set_overflow(m);
	return -1;
}
EXPORT_SYMBOL(seq_vprintf);

int seq_printf(struct seq_file *m, const char *f, ...)
{
	int ret;
	va_list args;

	va_start(args, f);
	ret = seq_vprintf(m, f, args);
	va_end(args);

	return ret;
}
EXPORT_SYMBOL(seq_printf);