fix some fc-hba are missing the statistics/*

sysfs/class_fibrechannel.go

@@ -152,6 +152,15 @@
 	var counters FibreChannelCounters
 
 	path := filepath.Join(hostPath, "statistics")
+
+   if _, err := os.Stat(path); err != nil {
+      if errors.Is(err, fs.ErrNotExist) {
+        // statistics directory not present, skip
+          return &counters, nil
+      }
+      return nil, err
+    }
+
 	files, err := os.ReadDir(path)
 	if err != nil {
 		return nil, err