On authentication we don't need to create the node before calling

On authentication we don't need to create the node before calling
the network stack since the stack will create the node for us if we
pass the ibss stack.  On assocation request the node already has to
exist, so we error out if we don't have a record of the node.  Fixes
hostap on 5 GHz channels, since now the node's channel is recorded
correctly.