fix block nesting bug causing filefd values to never be updated post initial call

collector/filefd_linux.go

@@ -59,13 +59,13 @@ func (c *fileFDStatCollector) Update(ch chan<- prometheus.Metric) (err error) {
 					Help:      fmt.Sprintf("File descriptor statistics: %s.", name),
 				},
 			)
+		}
 		v, err := strconv.ParseFloat(value, 64)
 		if err != nil {
 			return fmt.Errorf("invalid value %s in file-nr: %s", value, err)
 		}
 		c.metrics[name].Set(v)
 	}
-	}
 	for _, m := range c.metrics {
 		m.Collect(ch)
 	}