net: dsa: mv88e6xxx: Fix off by in one in mv88e6185_phylink_get_caps()

The <= ARRAY_SIZE() needs to be < ARRAY_SIZE() to prevent an out of
bounds error.

Fixes: d4ebf12b ("net: dsa: mv88e6xxx: populate supported_interfaces and mac_capabilities")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -585,7 +585,7 @@ static void mv88e6185_phylink_get_caps(struct mv88e6xxx_chip *chip, int port,
 {
 	u8 cmode = chip->ports[port].cmode;
 
-	if (cmode <= ARRAY_SIZE(mv88e6185_phy_interface_modes) &&
+	if (cmode < ARRAY_SIZE(mv88e6185_phy_interface_modes) &&
 	    mv88e6185_phy_interface_modes[cmode])
 		__set_bit(mv88e6185_phy_interface_modes[cmode],
 			  config->supported_interfaces);