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ethervgbe: do not give userspace the frame check sequence

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

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

@@ -592,7 +592,7 @@

 			/* plant new block, might fail if out of memory */

 			if(vgbenewrx(ctlr, i) == 0){

-				block->wp = block->rp + length;

+				block->wp = block->rp + length - 4;

 				etheriq(edev, block);

 				continue;

 			}