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/mrf.go

@@ -190,12 +190,12 @@ func (m *mrfState) healRoutine() {
 	}
 
 	for {
-		idler.Reset(mrfInfoResetInterval)
 		select {
 		case <-m.ctx.Done():
 			return
 		case <-idler.C:
 			m.resetMRFInfoIfNoPendingOps()
+			idler.Reset(mrfInfoResetInterval)
 		case setInfo := <-m.setReconnectEvent:
 			// Get the list of objects related the er.set
 			// to which the connected disk belongs.