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audiohda: pikeshedding

use seprint() for audiostat.

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

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

@@ -1281,15 +1281,16 @@

 	Fungroup *fg;

 	Widget *w;

 	uint r;

-	int k, i;

-	char *s;

+	int i;

+	char *s, *e;

 	s = a;

-	k = snprint(s, n, "bufsize %6d buffered %6ld\n", Blocksize, buffered(&ctlr->ring));

+	e = s + n;

+	s = seprint(s, e, "bufsize %6d buffered %6ld\n", Blocksize, buffered(&ctlr->ring));

 	for(i=0; i<Maxcodecs; i++){

 		if((codec = ctlr->codec[i]) == nil)

 			continue;

-		k += snprint(s+k, n-k, "codec %2d pin %3d\n",

+		s = seprint(s, e, "codec %2d pin %3d\n",

 			codec->id.codec, ctlr->pin);

 		for(fg=codec->fgroup; fg; fg=fg->next){

 			for(w=fg->first; w; w=w->next){

@@ -1296,7 +1297,7 @@

 				if(w->type != Wpin)

 					continue;

 				r = w->pin;

-				k += snprint(s+k, n-k, "pin %3d %s %s %s %s %s %s%s%s\n",

+				s = seprint(s, e, "pin %3d %s %s %s %s %s %s%s%s\n",

 					w->id.nid,

 					(w->pincap & Pout) != 0 ? "out" : "in",

 					pinport[(r >> 30) & 0x3],

@@ -1311,17 +1312,17 @@

 		}

 	}

-	k += snprint(s+k, n-k, "path ");

+	s = seprint(s, e, "path ");

 	for(w=ctlr->amp; w != nil; w = w->from){

-		k += snprint(s+k, n-k, "%3d %s %lux %lux %lux", w->id.nid, widtype[w->type&7], 

+		s = seprint(s, e, "%s %3d %lux %lux %lux", widtype[w->type&7], w->id.nid,

 			(ulong)w->cap, (ulong)w->pin, (ulong)w->pincap);

 		if(w == ctlr->src)

 			break;

-		k += snprint(s+k, n-k, " -> ");

+		s = seprint(s, e, " → ");

 	}

-	k += snprint(s+k, n-k, "\n");

+	s = seprint(s, e, "\n");

-	return k;

+	return s - (char*)a;

 }