This patch correct a bug in the delay of pktgen. 
It makes sure the inter-packet interval is accurate.
Signed-off-by: NDaniel Turull <daniel.turull@gmail.com>
Signed-off-by: NRobert Olsson <robert.olsson@its.uu.se>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>