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Add a protection in misc bsec ops for request with null size. For example OP-TEE error occurs when get_eth_nb() return 0 in setup_mac_address() for unknown part number because U-Boot read 0 OTPs. Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>