qcacld-3.0: Fix assert for NULL vdev in csr_nonscan_pending_ll_next
If SSR during sme close session when interface down and vdev
destroy, qdf_session_close_event is completed forcely before
peer detached, vdev becomes LOGICALLY_DELETED instead of
destroyed actually for peer ref count is held.
When bss is deleted and eWNI_SME_JOIN_RSP is handled,
is_disconnect_pending-> csr_nonscan_pending_ll_next is called,
wlan_objmgr_get_vdev_by_id_from_psoc return NULL, cmd.vdev is
NULL, NULL pointer dereference will happen.
Change-Id: I790a12483c2b9f967da9ced387935f93a6168e81
CRs-Fixed: 2316960