sandbox: Show a message when writing out the ram buffer

If state is not being written, but RAM is, we should still show a message,
so it is clear that this is happening.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/sandbox/cpu/state.c

@@ -421,6 +421,7 @@ int state_uninit(void)
 {
 	int err;
 
+	if (state->write_ram_buf || state->write_state)
 		log_info("Writing sandbox state\n");
 	state = &main_state;