net: bridge: export supported boolopts

Now that we have at least one bool option, we can export all of the
supported bool options via optmask when dumping them.

v2: new patch

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br.c

@@ -247,7 +247,7 @@ void br_boolopt_multi_get(const struct net_bridge *br,
 		optval |= (br_boolopt_get(br, opt_id) << opt_id);
 
 	bm->optval = optval;
-	bm->optmask = 0;
+	bm->optmask = GENMASK((BR_BOOLOPT_MAX - 1), 0);
 }
 
 /* private bridge options, controlled by the kernel */