null check 오타 수정....

src/main/java/com/palnet/biz/api/ctr/cntrl/service/CtrCntrlService.java

@@ -391,7 +391,7 @@ public class CtrCntrlService {
 		if(latestControl != null) {
 			CtrCntrlHstry latestHistory = cntrlHstryRepository.findFirstByCntrlIdOrderBySrvrRcvDtDesc(latestControl.getCntrlId()).orElse(null);
 
-			if(latestControl != null) {
+			if(latestHistory != null) {
 				long diffMinute = DateUtils.diffMinute(latestHistory.getSrvrRcvDt(), new Date());
 				log.info("DIFF MINUTE : {}", diffMinute);