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/ibm/emac/core.c b/drivers/net/ethernet/ibm/emac/core.c
index 256bdb8..4989481 100644
--- a/drivers/net/ethernet/ibm/emac/core.c
+++ b/drivers/net/ethernet/ibm/emac/core.c
@@ -2190,11 +2190,10 @@
 {
 	struct emac_instance *dev = netdev_priv(ndev);
 
-	strcpy(info->driver, "ibm_emac");
-	strcpy(info->version, DRV_VERSION);
-	info->fw_version[0] = '\0';
-	sprintf(info->bus_info, "PPC 4xx EMAC-%d %s",
-		dev->cell_index, dev->ofdev->dev.of_node->full_name);
+	strlcpy(info->driver, "ibm_emac", sizeof(info->driver));
+	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
+	snprintf(info->bus_info, sizeof(info->bus_info), "PPC 4xx EMAC-%d %s",
+		 dev->cell_index, dev->ofdev->dev.of_node->full_name);
 	info->regdump_len = emac_ethtool_get_regs_len(ndev);
 }