crypto/dpaa2_sec: fix memory allocation check

[ upstream commit 9a494a3 ]

When key length is 0, zmalloc will return NULL pointer
and in that case it should not return NOMEM.
So in this patch, adding a check on key length.

Fixes: 8d1f3a5 ("crypto/dpaa2_sec: support crypto operation")

Signed-off-by: Gagandeep Singh <g.singh@nxp.com>
Acked-by: Akhil Goyal <akhil.goyal@nxp.com>

drivers/crypto/dpaa2_sec/dpaa2_sec_dpseci.c

@@ -1842,7 +1842,7 @@ dpaa2_sec_cipher_init(struct rte_cryptodev *dev,
 	session->ctxt_type = DPAA2_SEC_CIPHER;
 	session->cipher_key.data = rte_zmalloc(NULL, xform->cipher.key.length,
 			RTE_CACHE_LINE_SIZE);
-	if (session->cipher_key.data == NULL) {
+	if (session->cipher_key.data == NULL && xform->cipher.key.length > 0) {
 		DPAA2_SEC_ERR("No Memory for cipher key");
 		rte_free(priv);
 		return -ENOMEM;