Fix memory leaks in arch and core

[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

Fix more leaks found in #6578

Test plan

CI is green

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.92%. Comparing base (ff4d660) to head (e15a51e).
⚠️ Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
librz/arch/isa/8051/8051_parse.c	71.42%	2 Missing and 2 partials ⚠️
librz/bin/pdb/symbol.c	0.00%	2 Missing ⚠️
librz/bin/pdb/gdata.c	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
librz/arch/isa/8051/8051_il.c	78.81% <100.00%> (ø)
librz/arch/isa/sh/sh_il.c	91.87% <100.00%> (ø)
librz/arch/pdb_process.c	64.39% <100.00%> (+0.17%)	⬆️
librz/core/cmd/cmd_debug.c	27.67% <100.00%> (+0.06%)	⬆️
librz/bin/pdb/gdata.c	48.14% <66.66%> (+4.14%)	⬆️
librz/bin/pdb/symbol.c	49.71% <0.00%> (-0.57%)	⬇️
librz/arch/isa/8051/8051_parse.c	85.31% <71.42%> (-0.57%)	⬇️

... and 7 files with indirect coverage changes

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