fix: r1cs iteration exit once section 1 read

[glamperd]

---

name: Pull Request
about: Open a PR for p0tion

Description

The logic only requires section 1 of the r1cs to be read. The pointer increments incorrectly if it is allowed to iterate beyond section 1, causing errors.

Fixes # (issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• [ x] Test with r1cs file that was previously failing

Checklist:

• [x ] My code follows the style guidelines of this project
• [ x] I have performed a self-review of my own code
• [ x] I have commented my code, particularly in hard-to-understand areas
• [ x] I have made corresponding changes to the documentation
• [ x] My changes generate no new warnings
• [ x] Any dependent changes have been merged and published in downstream modules
• [ x] I reviewed the code of conduct and contributors' guide

[ctrlc03]

Curious to see an example of this working and previous code failing? Other than that, LGTM