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/usb/asix_common.c b/drivers/net/usb/asix_common.c
index 50d1673..19bc23f 100644
--- a/drivers/net/usb/asix_common.c
+++ b/drivers/net/usb/asix_common.c
@@ -510,8 +510,8 @@
 {
 	/* Inherit standard device info */
 	usbnet_get_drvinfo(net, info);
-	strncpy (info->driver, DRIVER_NAME, sizeof info->driver);
-	strncpy (info->version, DRIVER_VERSION, sizeof info->version);
+	strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
+	strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
 	info->eedump_len = AX_EEPROM_LEN;
 }