datapath/vport: Remove an invalid comment

datapath/vport: Remove an invalid comment

Commit 3544358aa596 ("datapath: Improve kernel hash table") removed the
failure condition of ovs_vport_del by switching away from a custom
hashtable which allocated a new bucket, to an hlist with flexible-array
buckets. The function stopped returning failure code at that point, so
remove the misleading comment.

Signed-off-by: Aaron Conole <aconole@redhat.com>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@redhat.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>