ethtool: cosmetic: Use ethtool ethtool_cmd_speed API

This updates the network drivers so that they don't access the
ethtool_cmd::speed field directly, but use ethtool_cmd_speed()
instead.

For most of the drivers, these changes are purely cosmetic and don't
fix any problem, such as for those 1GbE/10GbE drivers that indirectly
call their own ethtool get_settings()/mii_ethtool_gset(). The changes
are meant to enforce code consistency and provide robustness with
future larger throughputs, at the expense of a few CPU cycles for each
ethtool operation.

All drivers compiled with make allyesconfig ion x86_64 have been
updated.

Tested: make allyesconfig on x86_64 + e1000e/bnx2x work
Signed-off-by: David Decotigny <decot@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/cxgb4/cxgb4_main.c b/drivers/net/cxgb4/cxgb4_main.c
index c02b4d3..7e3cfbe 100644
--- a/drivers/net/cxgb4/cxgb4_main.c
+++ b/drivers/net/cxgb4/cxgb4_main.c
@@ -1436,7 +1436,8 @@
 	cmd->supported = from_fw_linkcaps(p->port_type, p->link_cfg.supported);
 	cmd->advertising = from_fw_linkcaps(p->port_type,
 					    p->link_cfg.advertising);
-	cmd->speed = netif_carrier_ok(dev) ? p->link_cfg.speed : 0;
+	ethtool_cmd_speed_set(cmd,
+			      netif_carrier_ok(dev) ? p->link_cfg.speed : 0);
 	cmd->duplex = DUPLEX_FULL;
 	cmd->autoneg = p->link_cfg.autoneg;
 	cmd->maxtxpkt = 0;