net/sched: cbs: remove redundant assignment to variable port_rate

Variable port_rate is being initialized with a value that is never read
and is being re-assigned a little later on. The assignment is redundant
and hence can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/sched/sch_cbs.c

···
 {
 	struct ethtool_link_ksettings ecmd;
 	int speed = SPEED_10;
-	int port_rate = -1;
+	int port_rate;
 	int err;
 
 	err = __ethtool_get_link_ksettings(dev, &ecmd);