IB/cm: Release previously acquired reference counter in the cm_id_priv

In failure flow, the reference counter acquired was not released,
and the following error was reported:

drivers/infiniband/core/cm.c:3373 cm_lap_handler() warn: inconsistent
refcounting 'cm_id_priv->refcount.refs.counter':

Fixes: 7345201c3963 ("IB/cm: Improve the calling of cm_init_av_for_lap and cm_init_av_by_path")
Link: https://lore.kernel.org/r/[e-mail]
Reported-by: Dan Carpenter <[e-mail]>
Signed-off-by: Mark Zhang <[e-mail]>
Signed-off-by: Leon Romanovsky <[e-mail]>
Signed-off-by: Jason Gunthorpe <[e-mail]>

drivers/infiniband/core/cm.c

···
 	ret = cm_init_av_by_path(param->alternate_path, NULL, &alt_av);
 	if (ret) {
 		rdma_destroy_ah_attr(&ah_attr);
-		return -EINVAL;
+		goto deref;
 	}
 
 	spin_lock_irq(&cm_id_priv->lock);