[IPV6]: small fix for ipv6_dev_get_saddr(...)

The "score.rule++" doesn't make any sense for me. 
According to codes above, I think it should be "hiscore.rule++;" .

Signed-off-by: Yan Zheng<yanzheng@21cn.com>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index ddcf775..56a09a4 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1045,9 +1045,10 @@
 			}
 #endif
 			/* Rule 8: Use longest matching prefix */
-			if (hiscore.rule < 8)
+			if (hiscore.rule < 8) {
 				hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
-			score.rule++;
+				hiscore.rule++;
+			}
 			score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
 			if (score.matchlen > hiscore.matchlen) {
 				score.rule = 8;