[IPV6]: Fix source address selection.

The commit 95c385 broke proper source address selection for cases in which 
there is a address which is makred 'deprecated'. The commit mistakenly 
changed ifa->flags to ifa_result->flags (probably copy/paste error from a 
few lines above) in the 'Rule 3' address selection code.

The patch restores the previous RFC-compliant behavior.
Signed-off-by: NJiri Kosina <jkosina@suse.cz>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/addrconf.c

@@ -1021,7 +1021,7 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 				hiscore.rule++;
 			}
 			if (ipv6_saddr_preferred(score.addr_type) ||
-			   (((ifa_result->flags &
+			   (((ifa->flags &
 			    (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
 				score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 				if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {