fix(ffi): double-free in partition scan on error

[m7kss1]

Summary

Fix for the second part of: #7808

(gdb) bt
#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>)
    at ./nptl/pthread_kill.c:44
#1  __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
#2  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6)
    at ./nptl/pthread_kill.c:89
#3  0x000076a38cc4527e in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4  0x000076a38cc288ff in __GI_abort () at ./stdlib/abort.c:79
#5  0x000076a38cc297b6 in __libc_message_impl (fmt=fmt@entry=0x76a38cdce8d7 "%s\n")
    at ../sysdeps/posix/libc_fatal.c:134
#6  0x000076a38cca8ff5 in malloc_printerr (
    str=str@entry=0x76a38cdd1bf0 "free(): double free detected in tcache 2")
    at ./malloc/malloc.c:5775
#7  0x000076a38ccab55f in _int_free (av=0x76a38ce03ac0 <main_arena>, p=<optimized out>, 
    have_lock=0) at ./malloc/malloc.c:4541
#8  0x000076a38ccaddce in __GI___libc_free (mem=0x5be5cd9632c0) at ./malloc/malloc.c:3398
#9  0x000076a38eb6807e in alloc::alloc::dealloc (ptr=0x5be5cd9632c0, layout=...)
    at /home/ubuntu/.rustup/toolchains/1.91.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc/src/alloc.rs:114
#10 alloc::alloc::{impl#1}::deallocate (self=0x5be5cd95f708, ptr=..., layout=...)
    at /home/ubuntu/.rustup/toolchains/1.91.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc/src/alloc.rs:271
#11 0x000076a38ead9a64 in alloc::boxed::{impl#8}::drop<dyn vortex_scan::Partition, alloc::alloc::Global> (self=0x5be5cd95f6f8)
    at /home/ubuntu/.rustup/toolchains/1.91.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1666
#12 0x000076a38ead349e in core::ptr::drop_in_place<alloc::boxed::Box<dyn vortex_scan::Partition, alloc::alloc::Global>> ()
    at /home/ubuntu/.rustup/toolchains/1.91.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:804
#13 0x000076a38e8764de in core::ptr::drop_in_place<vortex_ffi::scan::VxPartitionScan> ()
    at /home/ubuntu/.rustup/toolchains/1.91.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:804
#14 0x000076a38e876fb8 in core::ptr::drop_in_place<alloc::boxed::Box<vortex_ffi::scan::VxPartitionScan, alloc::alloc::Global>> ()
    at /home/ubuntu/.rustup/toolchains/1.91.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:804
#15 0x000076a38e87f2f5 in core::mem::drop<alloc::boxed::Box<vortex_ffi::scan::VxPartitionScan, alloc::alloc::Global>> (_x=0x5be5cd95f6f0)
    at /home/ubuntu/.rustup/toolchains/1.91.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/mem/mod.rs:961
#16 0x000076a38e84efa7 in vortex_ffi::scan::vx_partition_free (ptr=0x5be5cd95f6f0)
    at vortex-ffi/src/macros.rs:295
#17 0x00005be5b0c81126 in operator() (__closure=0x7fff2208a8b0)
    at /home/ubuntu/vortex/vortex-ffi/test/scan.cpp:940

Testing

Verifying existing behavior is maintained.

[codspeed-hq]

Merging this PR will degrade performance by 20.47%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚡ 4 improved benchmarks
❌ 4 regressed benchmarks
✅ 1198 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	new_alp_prim_test_between[f64, 32768]	236.3 µs	192.5 µs	+22.76%
❌	Simulation	new_bp_prim_test_between[i16, 32768]	120.3 µs	134.8 µs	-10.8%
❌	Simulation	new_bp_prim_test_between[i32, 16384]	93.8 µs	108.8 µs	-13.81%
❌	Simulation	new_bp_prim_test_between[i32, 32768]	140.1 µs	169.1 µs	-17.13%
❌	Simulation	new_bp_prim_test_between[i64, 16384]	114.4 µs	143.8 µs	-20.47%
⚡	Simulation	new_alp_prim_test_between[f32, 16384]	119.2 µs	104.2 µs	+14.34%
⚡	Simulation	new_alp_prim_test_between[f32, 32768]	184.1 µs	155.4 µs	+18.47%
⚡	Simulation	new_alp_prim_test_between[f64, 16384]	148.1 µs	126.2 µs	+17.35%

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_{Comparing m7kss1:ji-fix-issue-7808-p2 (49781ed) with develop (aab4c34)}