net: dsa: mv88e6xxx: Fix masking of egress port

Add missing ~ to the usage of the mask.

Reported-by: Kevin Benson <Kevin.Benson@zii.aero>
Reported-by: Chris Healy <Chris.Healy@zii.aero>
Fixes: 5c74c54 ("net: dsa: mv88e6xxx: Split monitor port configuration")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/global1.c

@@ -278,13 +278,13 @@ int mv88e6095_g1_set_egress_port(struct mv88e6xxx_chip *chip,
 	switch (direction) {
 	case MV88E6XXX_EGRESS_DIR_INGRESS:
 		dest_port_chip = &chip->ingress_dest_port;
-		reg &= MV88E6185_G1_MONITOR_CTL_INGRESS_DEST_MASK;
+		reg &= ~MV88E6185_G1_MONITOR_CTL_INGRESS_DEST_MASK;
 		reg |= port <<
 		       __bf_shf(MV88E6185_G1_MONITOR_CTL_INGRESS_DEST_MASK);
 		break;
 	case MV88E6XXX_EGRESS_DIR_EGRESS:
 		dest_port_chip = &chip->egress_dest_port;
-		reg &= MV88E6185_G1_MONITOR_CTL_EGRESS_DEST_MASK;
+		reg &= ~MV88E6185_G1_MONITOR_CTL_EGRESS_DEST_MASK;
 		reg |= port <<
 		       __bf_shf(MV88E6185_G1_MONITOR_CTL_EGRESS_DEST_MASK);
 		break;