fix some fc-hba are missing the statistics/*

Signed-off-by: jiajian.chi <[email protected]>

Author: ZStack-Robot

sysfs/class_fibrechannel.go

@@ -153,6 +153,12 @@ func parseFibreChannelStatistics(hostPath string) (*FibreChannelCounters, error)
 	var counters FibreChannelCounters
 
 	path := filepath.Join(hostPath, "statistics")
+
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		fmt.Printf("Directory %s does not exist, skipping.\n", path)
+		return &counters, nil
+	}
+
 	files, err := os.ReadDir(path)
 	if err != nil {
 		return nil, err