[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<[e-mail]>
Acked-by: YOSHIFUJI Hideaki <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv6/addrconf.c

···
 			}
 #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;