rtc: isl12022: use true and false for boolean values

Assign true or false to boolean variables instead of an integer value.

This issue was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-isl12022.c

@@ -201,7 +201,7 @@ static int isl12022_rtc_set_time(struct device *dev, struct rtc_time *tm)
 				return ret;
 		}
 
-		isl12022->write_enabled = 1;
+		isl12022->write_enabled = true;
 	}
 
 	/* hours, minutes and seconds */