bridge: remove a useless comment

commit 6cbdceeb1cb12c7d620161925a8c3e81daadb2e4
    bridge: Dump vlan information from a bridge port
introduced a comment in an attempt to explain the
code logic. The comment is unfinished so it confuses more
than it explains, remove it.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>