Merge "wqcrypto: qcedev: Add null pointer check on sg_src"

/* Qualcomm Crypto Engine driver.

 *

 * Copyright (c) 2012-2017, The Linux Foundation. All rights reserved.

 * Copyright (c) 2012-2018, 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

	struct sps_iovec *iovec = sps_bam_pipe->iovec +

						sps_bam_pipe->iovec_count;

	if (!sg_src)

		return -ENOENT;

	while (nbytes > 0) {

		len = min(nbytes, sg_dma_len(sg_src));

		nbytes -= len;