[PATCH] usb: eth: lan78xx: Fix logic in lan78xx_read_otp() to avoid a warning

[Tom Rini]

In lan78xx_read_otp() we want to know if sig is LAN78XX_OTP_INDICATOR_1
or LAN78XX_OTP_INDICATOR_2.  In the case of matching the first one we
set offset to itself, and clang warns about this.  Rework the logic so
that if sig is the second indicator we adjust the offset as today and if
it does not match the first indicator we return -EINVAL

Cc: Marek Vasut <marex at denx.de>
Signed-off-by: Tom Rini <trini at konsulko.com>
---
 drivers/usb/eth/lan78xx.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/eth/lan78xx.c b/drivers/usb/eth/lan78xx.c
index e34ad2603fbb..d147412990de 100644
--- a/drivers/usb/eth/lan78xx.c
+++ b/drivers/usb/eth/lan78xx.c
@@ -146,11 +146,9 @@ static int lan78xx_read_otp(struct usb_device *udev, u32 offset,
 	ret = lan78xx_read_raw_otp(udev, 0, 1, &sig);
 
 	if (!ret) {
-		if (sig == LAN78XX_OTP_INDICATOR_1)
-			offset = offset;
-		else if (sig == LAN78XX_OTP_INDICATOR_2)
+		if (sig == LAN78XX_OTP_INDICATOR_2)
 			offset += 0x100;
-		else
+		else if (sig != LAN78XX_OTP_INDICATOR_1)
 			return -EINVAL;
 		ret = lan78xx_read_raw_otp(udev, offset, length, data);
 		if (ret)
-- 
2.17.1