No need to scan args in async_get_last_result

So wait_socket_readable() can be called directly.

Author: larskanis

ext/pg_connection.c

@@ -3060,7 +3060,8 @@ pgconn_async_get_last_result(VALUE self)
 for(;;) {
 int status;
 
-pgconn_block( 0, NULL, self ); /* wait for input (without blocking) before reading the last result */
+/* wait for input (without blocking) before reading each result */
+wait_socket_readable(self, NULL, get_result_readable);
 
 cur = gvl_PQgetResult(conn);
 if (cur == NULL)