net: bridge: explicitly convert between mdb entry state and port group flags

When creating a new multicast port group, there is implicit conversion
between the __u8 state member of struct br_mdb_entry and the unsigned
char flags member of struct net_bridge_port_group. This implicit
conversion relies on the fact that MDB_PERMANENT is equal to
MDB_PG_FLAGS_PERMANENT.

Let's be more explicit and convert the state to flags manually.

Signed-off-by: Vladimir Oltean <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

net/bridge/br_mdb.c

···
 	struct net_bridge_port_group __rcu **pp;
 	struct br_ip group, star_group;
 	unsigned long now = jiffies;
+	unsigned char flags = 0;
 	u8 filter_mode;
 	int err;
 
···
 	filter_mode = br_multicast_is_star_g(&group) ? MCAST_EXCLUDE :
 						       MCAST_INCLUDE;
 
-	p = br_multicast_new_port_group(port, &group, *pp, entry->state, NULL,
+	if (entry->state == MDB_PERMANENT)
+		flags |= MDB_PG_FLAGS_PERMANENT;
+
+	p = br_multicast_new_port_group(port, &group, *pp, flags, NULL,
 					filter_mode, RTPROT_STATIC);
 	if (unlikely(!p)) {
 		NL_SET_ERR_MSG_MOD(extack, "Couldn't allocate new port group");