[PATCH] os: Add missing _X_ATTRIBUTE_PRINTF to va_list variants

[Daniel Stone]

On Sun, Apr 24, 2011 at 07:58:33PM -0700, Jeremy Huddleston wrote:
> Signed-off-by: Jeremy Huddleston <jeremyhu at apple.com>

Reviewed-by: Daniel Stone <daniel at fooishbar.org>