IPv6: fix Routing Header Type 0 handling thinko

Oops, thinko.  The test for accempting a RH0 was exatly the wrong way
around.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

net/ipv6/exthdrs.c

@@ -399,7 +399,7 @@ static int ipv6_rthdr_rcv(struct sk_buff **skbp)
 		break;
 #endif
 	case IPV6_SRCRT_TYPE_0:
-		if (accept_source_route <= 0)
+		if (accept_source_route > 0)
 			break;
 		kfree_skb(skb);
 		return -1;