crypto/dpaa2_sec: fix memory allocation check
crypto/dpaa2_sec: fix memory allocation check

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: 8d1f3a5d751b ("crypto/dpaa2_sec: support crypto operation")
Cc: stable@dpdk.org

Signed-off-by: Gagandeep Singh <e6d306c72b92f139a7e7973ee8ee79cc78f81691@nxp.com>
Acked-by: Akhil Goyal <74d7c4c993a22c1d4f60c46ff3d95c969a24a25c@nxp.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk