gcc requires a cast

Author: rogerbinns

src/connection.c

@@ -801,7 +801,7 @@ Connection_as_async(PyObject *klass_, PyObject *args, PyObject *kwargs)
     goto error;
 
   APSW_FAULT(ConnectionAsyncTpNewFails, connection = (Connection *)klass->tp_new(klass, NULL, NULL),
-             connection = PyErr_NoMemory());
+             connection = (Connection*)PyErr_NoMemory());
   if (!connection)
     goto error;
   boxed_call->call_type = ConnectionInit;