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etherbcm: another try at the memleak

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

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

@@ -358,18 +358,16 @@

 			print("bcm: send queue full\n");

 			break;

 		}

-		if(incr == ctlr->sendcleani) {

-			bcmtransclean(edev, 0);

-			if(incr == ctlr->sendcleani)

-				break;

-		}

 		bp = qget(edev->oq);

 		if(bp == nil) break;

+		setmalloctag(bp, (ulong)(void*)bcmtransmit);

 		next = ctlr->sendr + ctlr->sendri * 4;

 		next[0] = 0;

 		next[1] = PADDR(bp->rp);

 		next[2] = (BLEN(bp) << 16) | PacketEnd;

 		next[3] = 0;

+		if(ctlr->sends[ctlr->sendri] != 0)

+			freeb(ctlr->sends[ctlr->sendri]);

 		ctlr->sends[ctlr->sendri] = bp;

 		csr32(ctlr, SendBDRingHostIndex) = ctlr->sendri = incr;

 	}