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devip: simplify ipbwrite() by using retun value of qbwrite()

--- a/sys/src/9/ip/devip.c

+++ b/sys/src/9/ip/devip.c

@@ -1185,7 +1185,6 @@

 	Conv *c;

 	Proto *x;

 	Fs *f;

-	int n;

 	switch(TYPE(ch->qid)){

 	case Qdata:

@@ -1198,9 +1197,8 @@

 		if(bp->next)

 			bp = concatblock(bp);

-		n = BLEN(bp);

-		qbwrite(c->wq, bp);

-		return n;

+		

+		return qbwrite(c->wq, bp);

 	default:

 		return devbwrite(ch, bp, offset);

 	}

-- 

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