Resolve "Improve security by enabling and enforcing more linting rules"

Description

See #242 (closed)

controller/config/gnmiSubscriptionConfig.go

@@ -15,7 +15,7 @@ const (
 var gnmiSubscriptionPaths [][]string
 
 // ReadGnmiSubscriptionPaths reads the paths the watcher should subscribe to provided in a file.
-func ReadGnmiSubscriptionPaths() error {
+func ReadGnmiSubscriptionPaths() (err error) {
 	currentDir, err := os.Getwd()
 	if err != nil {
 		return err
@@ -28,7 +28,11 @@ func ReadGnmiSubscriptionPaths() error {
 		return err
 	}
 
-	defer f.Close()
+	defer func() {
+		if ferr := f.Close(); ferr != nil {
+			err = ferr
+		}
+	}()
 
 	scanner := bufio.NewScanner(f)