net/sched: cbs: Fix integer overflow in cbs_set_port_rate()

The subsequent calculation of port_rate = speed * 1000 * BYTES_PER_KBIT,
where the BYTES_PER_KBIT is of type LL, may cause an overflow.
At least when speed = SPEED_20000, the expression to the left of port_rate
will be greater than INT_MAX.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Elena Salomatkina <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

net/sched/sch_cbs.c

···
 {
 	struct ethtool_link_ksettings ecmd;
 	int speed = SPEED_10;
-	int port_rate;
+	s64 port_rate;
 	int err;
 
 	err = __ethtool_get_link_ksettings(dev, &ecmd);