Libiio1 plot single channels mask

[dNechita]

PR Description

We need to keep just one channels mask across iio-osc. This is needed in order to be able to accurately count the number of enabled channels.

PR Type

• Bug fix (a change that fixes an issue)
• New feature (a change that adds new functionality)
• Breaking change (a change that affects other repos or cause CIs to fail)

PR Checklist

• I have followed the coding standards and guidelines
• I have conducted a self-review of my own code changes
• I have commented new code, particulary complex or unclear areas
• I have checked in CI output that no new warnings/errors got introduced
• I have updated documentation accordingly (GitHub Pages, READMEs, etc)

[nunojsa]

LGTM. Only nit comment is about the subject in the second commit. Not really a treewide change IMO but rather something in osc: ... (and yes, I realize you are also changing an header file :))

[dNechita]

LGTM. Only nit comment is about the subject in the second commit. Not really a treewide change IMO but rather something in osc: ... (and yes, I realize you are also changing an header file :))

Solved! Thanks for reviewing this.