rtc: class: remove redundant assignment to variable err

The variable err is being initialized with a value that is never read
and it is being updated later with a new value. The initialization
is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200402110411.508534-1-colin.king@canonical.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/class.c

@@ -48,7 +48,7 @@ int rtc_hctosys_ret = -ENODEV;
 
 static void rtc_hctosys(struct rtc_device *rtc)
 {
-	int err = -ENODEV;
+	int err;
 	struct rtc_time tm;
 	struct timespec64 tv64 = {
 		.tv_nsec = NSEC_PER_SEC >> 1,