Fix (?) negative refcount

Author: jheiv

Modules/_json.c

@@ -1730,7 +1730,6 @@ encoder_listencode_dict(PyEncoderObject *s, _PyAccu *acc,
     Py_XDECREF(item);
     Py_XDECREF(kstr);
     Py_XDECREF(ident);
-    Py_XDECREF(coerced_items);
     return -1;
 }