Removed signed-unsigned integer comparison in macro

[DMaroo]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've documented or updated the documentation of every function and struct this PR changes. If not so I've explained why.
• I've added tests that prove my fix is effective or that my feature works (if possible)
• I've updated the rizin book with the relevant information (if needed)

Detailed description

Needed for Cutter to build successfully.

Test plan

Green CI.

Closing issues

Helps in green CI for rizinorg/cutter#3247.