net: sfp: use linkmode_*() rather than open coding

Use the linkmode_*() helpers rather than open coding the calls to the
bitmap operators.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Russell King (Oracle)

drivers/net/phy/sfp-bus.c

@@ -328,7 +328,7 @@ void sfp_parse_support(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
 	 * modules use 2500Mbaud rather than 3100 or 3200Mbaud for
 	 * 2500BASE-X, so we allow some slack here.
 	 */
-	if (bitmap_empty(modes, __ETHTOOL_LINK_MODE_MASK_NBITS) && br_nom) {
+	if (linkmode_empty(modes) && br_nom) {
 		if (br_min <= 1300 && br_max >= 1200) {
 			phylink_set(modes, 1000baseX_Full);
 			__set_bit(PHY_INTERFACE_MODE_1000BASEX, interfaces);