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ether8139: fix pointer to smaller int tuncation warning on amd64

--- a/sys/src/9/pc/ether8139.c

+++ b/sys/src/9/pc/ether8139.c

@@ -479,7 +479,7 @@

 		size = BLEN(bp);

 		td = &ctlr->td[ctlr->tdh];

-		if(((int)bp->rp) & 0x03){

+		if(((uintptr)bp->rp) & 0x03){

 			memmove(td->data, bp->rp, size);

 			freeb(bp);

 			csr32w(ctlr, td->tsad, PCIWADDR(td->data));