The kernel commit 'mac80211: filter multicast data packets on AP /
AP_VLAN' started filtering out the test frame used in
ap_vlan_without_station and that resulted in false failures. For now,
ignore that "error" case to avoid claiming failures when the kernel is
doing what it is expected to do.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>