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audiohda: dont xspanalloc() Ctlr structure

theres no requirement for the Ctlr structure to be 8 byte aligned.
its not passed to hardware.

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

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

@@ -1468,8 +1468,11 @@

 	if(cards == nil){

 		p = nil;

 		while(p = hdamatch(p)){

-			ctlr = xspanalloc(sizeof(Ctlr), 8, 0);

-			memset(ctlr, 0, sizeof(Ctlr));

+			ctlr = mallocz(sizeof(Ctlr), 1);

+			if(ctlr == nil){

+				print("hda: can't allocate memory\n");

+				return -1;

+			}

 			ctlr->pcidev = p;

 			ctlr->next = cards;

 			cards = ctlr;

-- 

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