rtc: v3020: remove set but unused variable

Fix the following warning:
drivers/rtc/rtc-v3020.c: In function ‘rtc_probe’:
drivers/rtc/rtc-v3020.c:287:6: warning: variable ‘temp’ set but not used [-Wunused-but-set-variable]

Link: https://lore.kernel.org/r/20191122102212.400158-9-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-v3020.c

@@ -284,7 +284,6 @@ static int rtc_probe(struct platform_device *pdev)
 	struct v3020 *chip;
 	int retval = -EBUSY;
 	int i;
-	int temp;
 
 	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
@@ -302,7 +301,7 @@ static int rtc_probe(struct platform_device *pdev)
 	/* Make sure the v3020 expects a communication cycle
 	 * by reading 8 times */
 	for (i = 0; i < 8; i++)
-		temp = chip->ops->read_bit(chip);
+		chip->ops->read_bit(chip);
 
 	/* Test chip by doing a write/read sequence
 	 * to the chip ram */