These checks should go after the attributes have been parsed otherwise
we're using tb uninitialized.

Fixes: efa5356b ("bridge: per vlan dst_metadata netlink support")
Reported-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NNikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>