Run gosimple against codebase (#12928)

model/slack_attachment.go

@@ -111,11 +111,7 @@ func (s *SlackAttachment) Equals(input *SlackAttachment) bool {
 		}
 	}
 
-	if s.Timestamp != input.Timestamp {
-		return false
-	}
-
-	return true
+	return s.Timestamp == input.Timestamp
 }
 
 type SlackAttachmentField struct {