Simplifying memory sleep logic

pkg/storage/drivers/memory/memory.go

@@ -484,13 +484,10 @@ func (memory *memoryDriver) expireObjects() {
 			return
 		}
 		var keysToRemove []string
+		if len(memory.objectMetadata) > 0 {
 			memory.lock.RLock()
 			var earliest time.Time
-		empty := true
 			for key, object := range memory.objectMetadata {
-			if empty {
-				empty = false
-			}
 				if time.Now().Add(-memory.expiration).After(object.metadata.Created) {
 					keysToRemove = append(keysToRemove, key)
 				} else {
@@ -505,13 +502,12 @@ func (memory *memoryDriver) expireObjects() {
 				memory.objects.Remove(key)
 			}
 			memory.lock.Unlock()
-		if empty {
-			time.Sleep(memory.expiration)
-		} else {
 			sleepFor := earliest.Sub(time.Now())
 			if sleepFor > 0 {
 				time.Sleep(sleepFor)
 			}
+		} else {
+			time.Sleep(memory.expiration)
 		}
 	}
 }