buffer: include stdarg header

This fixes the following warnings:

buffer.c: In function 'nft_buf_put':
buffer.c:53:2: warning: implicit declaration of function 'va_start' [-Wimplicit-function-declaration]
  va_start(ap, fmt);
  ^
buffer.c:56:2: warning: implicit declaration of function 'va_end' [-Wimplicit-function-declaration]
  va_end(ap);
  ^

Signed-off-by: Giuseppe Longo <giuseppelng@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

0 files changed, 0 insertions, 0 deletions