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/qlcnic/qlcnic_ethtool.c b/drivers/net/qlcnic/qlcnic_ethtool.c
index 27726eb..c541461 100644
--- a/drivers/net/qlcnic/qlcnic_ethtool.c
+++ b/drivers/net/qlcnic/qlcnic_ethtool.c
@@ -166,7 +166,7 @@
 				     ADVERTISED_1000baseT_Half |
 				     ADVERTISED_1000baseT_Full);
 
-		ecmd->speed = adapter->link_speed;
+		ethtool_cmd_speed_set(ecmd, adapter->link_speed);
 		ecmd->duplex = adapter->link_duplex;
 		ecmd->autoneg = adapter->link_autoneg;
 
@@ -183,15 +183,15 @@
 		}
 
 		if (netif_running(dev) && adapter->has_link_events) {
-			ecmd->speed = adapter->link_speed;
+			ethtool_cmd_speed_set(ecmd, adapter->link_speed);
 			ecmd->autoneg = adapter->link_autoneg;
 			ecmd->duplex = adapter->link_duplex;
 			goto skip;
 		}
 
 		val = QLCRD32(adapter, P3P_LINK_SPEED_REG(pcifn));
-		ecmd->speed = P3P_LINK_SPEED_MHZ *
-			P3P_LINK_SPEED_VAL(pcifn, val);
+		ethtool_cmd_speed_set(ecmd, P3P_LINK_SPEED_MHZ *
+				      P3P_LINK_SPEED_VAL(pcifn, val));
 		ecmd->duplex = DUPLEX_FULL;
 		ecmd->autoneg = AUTONEG_DISABLE;
 	} else