power: supply: isp1704: remove redundant assignment to variable ret

The variable ret is being assigned with a value that is never
read and it is being updated later with a new value. The
assignment is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/isp1704_charger.c

@@ -342,7 +342,7 @@ static inline int isp1704_test_ulpi(struct isp1704_charger *isp)
 	int vendor;
 	int product;
 	int i;
-	int ret = -ENODEV;
+	int ret;
 
 	/* Test ULPI interface */
 	ret = isp1704_write(isp, ULPI_SCRATCH, 0xaa);