refactor: add more go linters (#970)

users/storage.go

@@ -40,7 +40,9 @@ func (s *Storage) Get(baseScope string, id interface{}) (user *User, err error)
 	if err != nil {
 		return
 	}
-	user.Clean(baseScope)
+	if err := user.Clean(baseScope); err != nil {
+		return nil, err
+	}
 	return
 }
 
@@ -52,7 +54,9 @@ func (s *Storage) Gets(baseScope string) ([]*User, error) {
 	}
 
 	for _, user := range users {
-		user.Clean(baseScope)
+		if err := user.Clean(baseScope); err != nil { //nolint:shadow
+			return nil, err
+		}
 	}
 
 	return users, err

users/users.go

@@ -4,11 +4,11 @@ import (
 	"path/filepath"
 	"regexp"
 
-	"github.com/filebrowser/filebrowser/v2/errors"
+	"github.com/spf13/afero"
 
+	"github.com/filebrowser/filebrowser/v2/errors"
 	"github.com/filebrowser/filebrowser/v2/files"
 	"github.com/filebrowser/filebrowser/v2/rules"
-	"github.com/spf13/afero"
 )
 
 // ViewMode describes a view mode.
@@ -52,6 +52,7 @@ var checkableFields = []string{
 
 // Clean cleans up a user and verifies if all its fields
 // are alright to be saved.
+//nolint:gocyclo
 func (u *User) Clean(baseScope string, fields ...string) error {
 	if len(fields) == 0 {
 		fields = checkableFields