selinux: cleanup the internal AVC counters on error in avc_update()

In avc_update_node() after calling avc_alloc_node() which,
increments avc->avc_cache.active_nodes counter,
but kmem_cache_free() were called when avc_xperms_populate()
fails , which does not decrements the active_nodes count,
resulting in the avc->avc_cache.active_nodes counter having
false value.so calling avc_node_node() to fix it.

Change-Id: Ic0298162cc766c0f21be7ab232e259766654dad3
Signed-off-by: Jaihind Yadav <jaihindyadav@codeaurora.org>
Signed-off-by: Ravi Kumar Siddojigari <rsiddoji@codeaurora.org>
Signed-off-by: vijay.rayabarapu <vijay.rayabarapu@codeaurora.org>