pythongh-94028: Clear and reset sqlite3 statements properly in cursor iternext

Author: erlend-aasland

Modules/_sqlite/cursor.c

@@ -1129,10 +1129,13 @@ pysqlite_cursor_iternext(pysqlite_Cursor *self)
             self->rowcount = (long)sqlite3_changes(self->connection->db);
         }
         (void)stmt_reset(self->statement);
+        Py_CLEAR(self->statement);
     }
     else if (rc != SQLITE_ROW) {
         (void)_pysqlite_seterror(self->connection->state,
                                  self->connection->db);
+        (void)stmt_reset(self->statement);
+        Py_CLEAR(self->statement);
         Py_DECREF(row);
         return NULL;
     }