Fix memory leaks in the dmi command's module lookup

[notxvilka]

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 every RZ_API function and struct this PR changes.
• I've added tests that prove my changes are effective (required for changes to RZ_API).
• I've updated the Rizin book with the relevant information (if needed).
• I've used AI tools to generate fully or partially these code changes and I'm sure the changes are not copyrighted by somebody else.

Detailed description

More leaks found in #6578

Test plan

CI is green

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.93%. Comparing base (6f630b7) to head (04eaaa5).
⚠️ Report is 8 commits behind head on dev.

Files with missing lines	Patch %	Lines
librz/core/cmd/cmd_debug.c	71.42%	1 Missing and 7 partials ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
librz/core/cmd/cmd_debug.c	28.15% <71.42%> (+0.47%)	⬆️

... and 8 files with indirect coverage changes

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[Rot127]

Please make it an API function.