char/tpm: Improve a size determination in nine functions

[SF Markus Elfring]

> One more word of advice: send the three as separate patches.

I do not see a need for an immediate resend at the moment.


> My guess is that it takes a factor longer time to apply 4/4
> than other patches because there's more limited crowd who can test it.

This is fine for me if somebody would like to integrate
this update suggestion at all.


How do you think about to separate replies better between affected
update steps?

Regards,
Markus