Avoid duplicate definitions for goto, fixes #1514

jedi/api/__init__.py

@@ -318,7 +318,8 @@ class Script(object):
         )
 
         defs = [classes.Definition(self._inference_state, d) for d in set(names)]
-        return helpers.sorted_definitions(defs)
+        # Avoid duplicates
+        return list(set(helpers.sorted_definitions(defs)))
 
     @validate_line_column
     def help(self, line=None, column=None):