This is a fix for bug 572201 @ bugs.debian.org

This patch fixes the TX_LIMIT feature flag. The previous logic check
for TX_LIMIT2 also took into account a device that only had TX_LIMIT
set.
Reported-by: NStephen Mulcahu <stephen.mulcahy@deri.org>
Reported-by: NBen Huchings <ben@decadent.org.uk>
Signed-off-by: NAyaz Abdulla <aabdulla@nvidia.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>