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/acenic.c b/drivers/net/acenic.c
index 0b4d8d1..a579899 100644
--- a/drivers/net/acenic.c
+++ b/drivers/net/acenic.c
@@ -2658,15 +2658,15 @@
 
 	link = readl(&regs->GigLnkState);
 	if (link & LNK_1000MB)
-		ecmd->speed = SPEED_1000;
+		ethtool_cmd_speed_set(ecmd, SPEED_1000);
 	else {
 		link = readl(&regs->FastLnkState);
 		if (link & LNK_100MB)
-			ecmd->speed = SPEED_100;
+			ethtool_cmd_speed_set(ecmd, SPEED_100);
 		else if (link & LNK_10MB)
-			ecmd->speed = SPEED_10;
+			ethtool_cmd_speed_set(ecmd, SPEED_10);
 		else
-			ecmd->speed = 0;
+			ethtool_cmd_speed_set(ecmd, 0);
 	}
 	if (link & LNK_FULL_DUPLEX)
 		ecmd->duplex = DUPLEX_FULL;