[NO-TICKET] Remove unused function attributes (#16878)

services/slackimport/slackimport.go

@@ -89,7 +89,7 @@ type Actions struct {
 	CreateChannel          func(*model.Channel, bool) (*model.Channel, *model.AppError)
 	DoUploadFile           func(time.Time, string, string, string, string, []byte) (*model.FileInfo, *model.AppError)
 	GenerateThumbnailImage func(image.Image, string)
-	GeneratePreviewImage   func(image.Image, string, int)
+	GeneratePreviewImage   func(image.Image, string)
 	InvalidateAllCaches    func()
 	MaxPostSize            func() int
 	PrepareImage           func(fileData []byte) (image.Image, int, int)
@@ -771,10 +771,10 @@ func (si *SlackImporter) oldImportFile(timestamp time.Time, file io.Reader, team
 	}
 
 	if fileInfo.IsImage() && fileInfo.MimeType != "image/svg+xml" {
-		img, width, _ := si.actions.PrepareImage(data)
+		img, _, _ := si.actions.PrepareImage(data)
 		if img != nil {
 			si.actions.GenerateThumbnailImage(img, fileInfo.ThumbnailPath)
-			si.actions.GeneratePreviewImage(img, fileInfo.PreviewPath, width)
+			si.actions.GeneratePreviewImage(img, fileInfo.PreviewPath)
 		}
 	}