Move assertion where it actually belongs, since it does not apply to the...

Move assertion where it actually belongs, since it does not apply to the buffer cleanup case (which semantically jumps over it with a 'goto').

Cython/Compiler/Nodes.py

@@ -2077,11 +2077,11 @@ class FuncDefNode(StatNode, BlockNode):
                 elif gil_owned['error']:
                     code.put_release_ensured_gil()
                     gil_owned['error'] = False
+                assert gil_owned['error'] == gil_owned['success'], "%s: error path %s != success path %s" % (
+                    self.pos, gil_owned['error'], gil_owned['success'])
 
         # ----- Non-error return cleanup
         code.put_label(code.return_label)
-        assert gil_owned['error'] == gil_owned['success'], "%s: error path %s != success path %s" % (
-            self.pos, gil_owned['error'], gil_owned['success'])
 
         for entry in used_buffer_entries:
             assure_gil('success')