Avoid calling .Reset() on active timer (#14941)

.Reset() documentation states:

    For a Timer created with NewTimer, Reset should be invoked only on stopped
    or expired timers with drained channels.

This change is just to comply with this requirement as there might be some
runtime dependent situation that might lead to unexpected behavior.

cmd/bucket-replication-stats.go

@@ -169,19 +169,17 @@ func (r *ReplicationStats) loadInitialReplicationMetrics(ctx context.Context) {
 	)
 outer:
 	for {
-		rTimer.Reset(time.Minute)
 		select {
 		case <-ctx.Done():
 			return
 		case <-rTimer.C:
 			dui, err = loadDataUsageFromBackend(GlobalContext, newObjectLayerFn())
-			if err != nil {
-				continue
-			}
 			// If LastUpdate is set, data usage is available.
-			if !dui.LastUpdate.IsZero() {
+			if err == nil && !dui.LastUpdate.IsZero() {
 				break outer
 			}
+
+			rTimer.Reset(time.Minute)
 		}
 	}