cls_flower: Add extack support for src and dst port range options

[ Upstream commit bd7d4c12 ]

Pass extack down to fl_set_key_port_range() and set message on error.

Both the min and max ports would qualify as invalid attributes here.
Report the min one as invalid, as it's probably what makes the most
sense from a user point of view.

Signed-off-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: d3f87278 ("net/sched: flower: Ensure both minimum and maximum ports are specified")
Signed-off-by: Sasha Levin <sashal@kernel.org>