When key length is 0, zmalloc will return NULL pointor
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: akhil.goyal@nxp.com
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Signed-off missing. Will add it while merging in crypto tree.
Acked-by: Akhil Goyal <redacted>