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devip: fix ipv6 mss clamping

--- a/sys/src/9/ip/ipv6.c

+++ b/sys/src/9/ip/ipv6.c

@@ -90,7 +90,7 @@

 	medialen = ifc->maxtu - ifc->m->hsize;

 	if(gating)

-		tcpmssclamp((uchar*)eh, len, medialen);

+		tcpmssclamp(bp->rp, BLEN(bp), medialen);

 	else {

 		eh->vcf[0] = IP_VER6;

 		eh->vcf[0] |= tos >> 4;