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ether8390: remove unused variables

--- a/sys/src/9/pc/ether8390.c

+++ b/sys/src/9/pc/ether8390.c

@@ -461,7 +461,6 @@

 	int len;

 	Dp8390 *ctlr;

 	Block *bp;

-	uchar minpkt[ETHERMINTU], *rp;

 	ctlr = ether->ctlr;

@@ -480,11 +479,10 @@

 	 * start the transmission.

 	 */

 	len = BLEN(bp);

-	rp = bp->rp;

 	if(ctlr->ram)

-		memmove((uchar*)KADDR(ether->mem) + ctlr->tstart*Dp8390BufSz, rp, len);

+		memmove((uchar*)KADDR(ether->mem) + ctlr->tstart*Dp8390BufSz, bp->rp, len);

 	else

-		dp8390write(ctlr, ctlr->tstart*Dp8390BufSz, rp, len);

+		dp8390write(ctlr, ctlr->tstart*Dp8390BufSz, bp->rp, len);

 	freeb(bp);

 	regw(ctlr, Tbcr0, len & 0xFF);