ethtool: fix drvinfo strings set in drivers

Use strlcpy where possible to ensure the string is \0 terminated.
Use always sizeof(string) instead of 32, ETHTOOL_BUSINFO_LEN
and custom defines.
Use snprintf instead of sprint.
Remove unnecessary inits of ->fw_version
Remove unnecessary inits of drvinfo struct.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/um/drivers/net_kern.c

@@ -274,8 +274,8 @@ static void uml_net_poll_controller(struct net_device *dev)
 static void uml_net_get_drvinfo(struct net_device *dev,
 				struct ethtool_drvinfo *info)
 {
-	strcpy(info->driver, DRIVER_NAME);
-	strcpy(info->version, "42");
+	strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
+	strlcpy(info->version, "42", sizeof(info->version));
 }
 
 static const struct ethtool_ops uml_net_ethtool_ops = {