Merge branch 'bna-next'

Merge branch 'bna-next'

Ivan Vecera says:

====================
bna: remove useless global variables

The set removes useless global bnad_list as well as bnad->entry that track
a list of driver instances but it is not used anywhere. The associated
bnad_list_mutex is removed as well but as it is also used to protect
bna_id increment it is necessary to convert bna_id to atomic_t.
====================

Signed-off-by: Ivan Vecera <ivecera@redhat.com>