rtc: ds1672: remove unnecessary check

The rtc pointer is already checked earlier, it is not necessary to check it
again.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20190818215232.17320-1-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-ds1672.c

@@ -128,9 +128,6 @@ static int ds1672_probe(struct i2c_client *client,
 	if (err)
 		return err;
 
-	if (IS_ERR(rtc))
-		return PTR_ERR(rtc);
-
 	i2c_set_clientdata(client, rtc);
 
 	return 0;