xfrm: simplify xfrm_address_t use

In many places, the a6 field is typecasted to struct in6_addr. As the
fields are in union anyway, just add in6_addr type to the union and
get rid of the typecasting.

Modifying the uapi header is okay, the union has still the same size.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index d0ac7d7b..461f835 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1025,7 +1025,7 @@
 	case AF_INET:
 		return addr->a4 == 0;
 	case AF_INET6:
-		return ipv6_addr_any((struct in6_addr *)&addr->a6);
+		return ipv6_addr_any(&addr->in6);
 	}
 	return 0;
 }
@@ -1238,8 +1238,8 @@
 		memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
 		break;
 	case AF_INET6:
-		*(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
-		*(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
+		saddr->in6 = fl->u.ip6.saddr;
+		daddr->in6 = fl->u.ip6.daddr;
 		break;
 	}
 }