TextEditor: Don't try to load contents of files we didn't even open

If the CFile::open() call fails, we shouldn't continue with trying to
load the file.

Applications/TextEditor/TextEditorWidget.cpp

@@ -192,11 +192,10 @@ void TextEditorWidget::set_path(const FileSystemPath& file)
 
 void TextEditorWidget::open_sesame(const String& path)
 {
- dbgprintf("Our path to file in open_sesame: %s\n", path.characters());
  CFile file(path);
-
  if (!file.open(CIODevice::ReadOnly)) {
  GMessageBox::show(String::format("Opening \"%s\" failed: %s", path.characters(), strerror(errno)), "Error", GMessageBox::Type::Error, GMessageBox::InputType::OK, window());
+ return;
  }
 
  m_editor->set_text(file.read_all());