Undefined index: autosave_form_path error in autosave_remove_autosaved_form_submit

I'm not sure what the circumstances are that would cause it, but I sometimes see errors like this:

Notice: Undefined index: autosave_form_path in autosave_remove_autosaved_form_submit() (line 262 of /sites/all/modules/autosave/autosave.module).

Seems harmless enough to check whether $_POST['autosave_form_path'] exists before attempting to use it. Patch attached.