Backport patch fixing compilation error for sa_data not well defined.
This is triggered only on platform that makes use of fortify string and
cause compilation error due to the fact that sa_data is not well defined
and his size is arbitrary.
Patch has been accepted in the PF_RING project and this is just a
backport.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
