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>

drivers/net/ethernet/marvell/pxa168_eth.c

@@ -1443,10 +1443,10 @@ static int pxa168_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 static void pxa168_get_drvinfo(struct net_device *dev,
 			       struct ethtool_drvinfo *info)
 {
-	strncpy(info->driver, DRIVER_NAME, 32);
-	strncpy(info->version, DRIVER_VERSION, 32);
-	strncpy(info->fw_version, "N/A", 32);
-	strncpy(info->bus_info, "N/A", 32);
+	strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
+	strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
+	strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
+	strlcpy(info->bus_info, "N/A", sizeof(info->bus_info));
 }
 
 static const struct ethtool_ops pxa168_ethtool_ops = {