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fix previous MERGE commit... why did that modify ipaux?

--- a/sys/src/cmd/ip/ppp/ipaux.c

+++ b/sys/src/cmd/ip/ppp/ipaux.c

@@ -8,18 +8,10 @@

 ptclcsum(Block *bp, int offset, int len)

 {

 	uchar *addr;

-	ulong losum, hisum;

-	ushort csum;

-	int odd, blen, x;

+	int blen;

-	/* Correct to front of data area */

-	while(bp != nil && offset && offset >= BLEN(bp)) {

-		offset -= BLEN(bp);

-		bp = bp->next;

-	}

-	if(bp == nil)

+	if(bp == nil || bp->rptr + offset >= bp->wptr)

 		return 0;

-

 	addr = bp->rptr + offset;

 	blen = BLEN(bp) - offset;

 	if(blen < len)