windows: Replace csp_free()
csp_free() has been removed by  Replace csp_free()
with free();
@@ -145,7 +145,7 @@ int csp_usart_open(const csp_usart_conf_t * conf, csp_usart_callback_t rx_callba
res = csp_windows_thread_create(usart_rx_thread, "usart_rx", 0, ctx, 0, &ctx->rx_thread);
if (res) {
CloseHandle(ctx->fd);
- csp_free(ctx);
+ free(ctx);
return res;
}
