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audiohda: fix null pointer dereference

--- a/sys/src/9/pc/audiohda.c

+++ b/sys/src/9/pc/audiohda.c

@@ -572,7 +572,7 @@

 			break;

 		for(i=0; i<w->nlist; i++){

 			v = w->list[i];

-			if(v->from)

+			if(v == nil || v->from)

 				continue;

 			v->from = w;

 			q[r++] = v;

-- 

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