connection.c: tuned assert

src/microhttpd/connection.c

@@ -2958,7 +2958,7 @@ MHD_connection_handle_write (struct MHD_Connection *connection)
     {
       const size_t wb_ready = connection->write_buffer_append_offset
                               - connection->write_buffer_send_offset;
-      mhd_assert (connection->write_buffer_append_offset > \
+      mhd_assert (connection->write_buffer_append_offset >= \
                   connection->write_buffer_send_offset);
 
       /* if the response body is not available, we use MHD_send_on_connection_() */