Add comment about nvIndex name.

Author: dgarske

src/tpm2.c

@@ -4831,6 +4831,9 @@ TPM_RC TPM2_NV_Write(NV_Write_In* in)
         TPM2_Packet_Init(ctx, &packet);
 
         TPM2_Packet_AppendU32(&packet, in->authHandle);
+        /* When using an HMAC or Policy session make sure the NV "name" is
+         * populated in the TPM2_AUTH_SESSION name.name. This is a computed
+         * hash (see TPM2_HashNvPublic) */
         TPM2_Packet_AppendU32(&packet, in->nvIndex);
         TPM2_Packet_AppendAuth(&packet, ctx, &info);