Update csvprovider.go

pkg/cloud/csvprovider.go

@@ -280,7 +280,7 @@ func PVValueFromMapField(m string, n *v1.PersistentVolume) string {
 		}
 	} else if len(mf) > 2 && mf[0] == "spec" {
 		if mf[1] == "capacity" && mf[2] == "storage" {
-			skey := n.Spec.Capacity["Storage"]
+			skey := n.Spec.Capacity["storage"]
 			return skey.String()
 		} else {
 			klog.V(4).Infof("[ERROR] Unsupported InstanceIDField %s in CSV For PV", m)