crypto: ccree - do not copy zero size MLLI table

When we are given a 0 sized cryptlen and assoclen in
a scatterlist with two entries we were falsely trying to
create a zero length MLLI table, causing the HW to choke.
Don't try to copy a zero sized MLLI table.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/ccree/cc_aead.c

@@ -1196,9 +1196,9 @@ static void cc_mlli_to_sram(struct aead_request *req,
 	struct cc_aead_ctx *ctx = crypto_aead_ctx(tfm);
 	struct device *dev = drvdata_to_dev(ctx->drvdata);
 
-	if (req_ctx->assoc_buff_type == CC_DMA_BUF_MLLI ||
+	if ((req_ctx->assoc_buff_type == CC_DMA_BUF_MLLI ||
 	    req_ctx->data_buff_type == CC_DMA_BUF_MLLI ||
-	    !req_ctx->is_single_pass) {
+	    !req_ctx->is_single_pass) && req_ctx->mlli_params.mlli_len) {
 		dev_dbg(dev, "Copy-to-sram: mlli_dma=%08x, mlli_size=%u\n",
 			(unsigned int)ctx->drvdata->mlli_sram_addr,
 			req_ctx->mlli_params.mlli_len);