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sndio: audiodevclose: don't crash if failed to init before

--- a/kern/devaudio-sndio.c

+++ b/kern/devaudio-sndio.c

@@ -40,7 +40,8 @@

 void

 audiodevclose(void)

 {

-	sio_close(hdl);

+	if (hdl != NULL)

+		sio_close(hdl);

 }

 void