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/niu.c b/drivers/net/niu.c
index 524e800..cc25bff0 100644
--- a/drivers/net/niu.c
+++ b/drivers/net/niu.c
@@ -6844,7 +6844,7 @@
 	cmd->supported = lp->supported;
 	cmd->advertising = lp->active_advertising;
 	cmd->autoneg = lp->active_autoneg;
-	cmd->speed = lp->active_speed;
+	ethtool_cmd_speed_set(cmd, lp->active_speed);
 	cmd->duplex = lp->active_duplex;
 	cmd->port = (np->flags & NIU_FLAGS_FIBER) ? PORT_FIBRE : PORT_TP;
 	cmd->transceiver = (np->flags & NIU_FLAGS_XCVR_SERDES) ?