Correct the documentation of mem_is_zero
/** An invalid export length that will never be set by psa_export_key(). */
static const size_t INVALID_EXPORT_LENGTH = ~0U;
-/** Test if a buffer is not all-bits zero.
+/** Test if a buffer is all-bits zero.
*
* \param buffer Pointer to the beginning of the buffer.
* \param size Size of the buffer in bytes.
