Remove unused variable

[thomasschaub]

This is in a public header and might generate a warning.

[msftclas]

Hi @thomasschaub, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!

This seems like a small (but important) contribution, so no Contribution License Agreement is required at this point. Real humans will now evaluate your PR.

TTYL, MSBOT;

[kavyako]

hey Thomas

Thank you for fixing the issue. I have merged the changes into our development branch.
We do our active development in the development branch. During release, we merge the development branch to master. Your changes will make it to the master branch with our next release (2.7.0).

Thanks
Kavya.

[kavyako]

Closing the PR, changes merged to development branch:
4ba746c