bridge: Netlink interface fix.

bridge: Netlink interface fix.

This commit is correcting NETLINK br_fill_ifinfo() to be able to
handle 'filter_mask' with multiple flags asserted.

Fixes: 36a8e8e265420 ("bridge: Extend br_fill_ifinfo to return MPR status")
Signed-off-by: Henrik Bjoernlund <[email protected]>
Reviewed-by: Horatiu Vultur <[email protected]>
Suggested-by: Nikolay Aleksandrov <[email protected]>
Tested-by: Horatiu Vultur <[email protected]>
Acked-by: Nikolay Aleksandrov <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>