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nusb/ether: dont break lan78xx chip (rpi3b+)

The rpi3b+ uses different chip lan78xx.
This one does not append fcs in received frames,
so the previous change broke ethernet.

--- a/sys/src/cmd/nusb/ether/lan78xx.c

+++ b/sys/src/cmd/nusb/ether/lan78xx.c

@@ -252,11 +252,10 @@

 			break;

 		if((hd & Rxerror) == 0){

 			if(n == BLEN(b)){

-				b->wp -= 4;

 				etheriq(b);

 				return 0;

 			}

-			etheriq(copyblock(b, n - 4));

+			etheriq(copyblock(b, n));

 		}

 		b->rp = (uchar*)(((uintptr)b->rp + n + 3)&~3);

 	}

-- 

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