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devip: ignore reserved fragment offset bits

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

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

@@ -481,7 +481,7 @@

 	 *  and get rid of any fragments that might go

 	 *  with it.

 	 */

-	if(offset == 0) {		/* 1st frag is also last */

+	if((offset & ~6) == 0) {	/* 1st frag is also last */

 		if(f != nil) {

 			ip->stats[ReasmFails]++;

 			ipfragfree6(ip, f);