clippy: manual_dangling_ptr

[steviez]

Problem

Working towards #6850, broken out from #6910

Summary of Changes

Avoid the instance of manual_dangling_ptr; this lint was added in Rust 1.88:
https://rust-lang.github.io/rust-clippy/master/index.html#manual_dangling_ptr

[mergify]

The Firedancer team maintains a line-for-line reimplementation of the
native programs, and until native programs are moved to BPF, those
implementations must exactly match their Agave counterparts.
If this PR represents a change to a native program implementation (not
tests), please include a reviewer from the Firedancer team. And please
keep refactors to a minimum.

[steviez]

The Firedancer team maintains a line-for-line reimplementation of the native programs, and until native programs are moved to BPF, those implementations must exactly match their Agave counterparts. If this PR represents a change to a native program implementation (not tests), please include a reviewer from the Firedancer team. And please keep refactors to a minimum.

Test code so no worries about this

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.2%. Comparing base (96bef97) to head (00b535a).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #6912     +/-   ##
=========================================
- Coverage    83.3%    83.2%   -0.1%     
=========================================
  Files         853      853             
  Lines      377570   377570             
=========================================
- Hits       314525   314513     -12     
- Misses      63045    63057     +12     

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