rtc: imxdi: remove unused variable

This variable is no longer used and the compiler rightly complains that
it should be removed.

../drivers/rtc/rtc-imxdi.c: In function ‘dryice_rtc_set_alarm’:
../drivers/rtc/rtc-imxdi.c:633:16: warning: unused variable ‘now’ [-Wunused-variable]
unsigned long now;
^~~

Rework to remove the unused variable.

Fixes: 629d488a3eb6 ("rtc: imxdi: remove unnecessary check")
Signed-off-by: Anders Roxell <[e-mail]>
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/rtc/rtc-imxdi.c

···
 static int dryice_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 {
 	struct imxdi_dev *imxdi = dev_get_drvdata(dev);
-	unsigned long now;
 	int rc;
 
 	/* write the new alarm time */