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>
diff --git a/drivers/net/ethernet/aeroflex/greth.c b/drivers/net/ethernet/aeroflex/greth.c
index aa53115..480662b 100644
--- a/drivers/net/ethernet/aeroflex/greth.c
+++ b/drivers/net/ethernet/aeroflex/greth.c
@@ -1127,10 +1127,11 @@
 {
 	struct greth_private *greth = netdev_priv(dev);
 
-	strncpy(info->driver, dev_driver_string(greth->dev), 32);
-	strncpy(info->version, "revision: 1.0", 32);
-	strncpy(info->bus_info, greth->dev->bus->name, 32);
-	strncpy(info->fw_version, "N/A", 32);
+	strlcpy(info->driver, dev_driver_string(greth->dev),
+		sizeof(info->driver));
+	strlcpy(info->version, "revision: 1.0", sizeof(info->version));
+	strlcpy(info->bus_info, greth->dev->bus->name, sizeof(info->bus_info));
+	strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 	info->eedump_len = 0;
 	info->regdump_len = sizeof(struct greth_regs);
 }