Merge "diag: Fix possible null pointer dereference"

/* Copyright (c) 2008-2014, The Linux Foundation. All rights reserved.

/* Copyright (c) 2008-2014, 2016, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

	mempool = &diag_mempools[index];

	spin_lock_irqsave(&mempool->lock, flags);

	if (mempool->count == 0) {

	if (mempool->count == 0 && mempool->pool != NULL) {

		mempool_destroy(mempool->pool);

		mempool->pool = NULL;

	} else {