[BUG] Memory leak in wamr compiler when loading initializer expression

[teyahb8]

Describe the bug
wamrc --enable-gc ... successfully compiles a valid Wasm GC module containing a global initializer that constructs a nested GC array using array.new_fixed, but LeakSanitizer reports leaked allocations from load_init_expr while loading the global section. The leak appears to be in loader-side handling of GC global initializer expressions.

Version
Version: 2.4.3
Commit: 4b306f0

To Reproduce
Steps to reproduce the behavior:

1. Convert PoC to wasm:

(module
  (type $bytes (array i8))
  (type $arrs  (array (ref eq)))
  (global (ref $arrs)
    i32.const 0
    array.new_fixed $bytes 1
    array.new_fixed $arrs 1
  )
)

2. Compile: wamrc --bounds-checks=1 --enable-gc -o poc.aot poc.wasm

Expected behavior
No memory leak should occur.

Actual Result

==3203399==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 24 byte(s) in 1 object(s) allocated from:
    #0 0x5555558f3797 in malloc (wasm-micro-runtime/wamr-compiler/build/wamrc-2.4.3+0x39f797)
    #1 0x555555a82cc0 in loader_malloc wasm-micro-runtime/core/iwasm/interpreter/wasm_loader.c:345
    #2 0x555555a82cc0 in load_init_expr wasm-micro-runtime/core/iwasm/interpreter/wasm_loader.c:1367
    #3 0x555555aa2630 in load_global_section wasm-micro-runtime/core/iwasm/interpreter/wasm_loader.c:4355
    #4 0x555555aa2630 in load_from_sections wasm-micro-runtime/core/iwasm/interpreter/wasm_loader.c:6401
    #5 0x555555aaa8e8 in load wasm-micro-runtime/core/iwasm/interpreter/wasm_loader.c:7111
    #6 0x555555aaa8e8 in wasm_loader_load wasm-micro-runtime/core/iwasm/interpreter/wasm_loader.c:7288
    #7 0x555555a694fb in wasm_runtime_load_ex wasm-micro-runtime/core/iwasm/common/wasm_runtime_common.c:1515
    #8 0x555555a694fb in wasm_runtime_load_ex wasm-micro-runtime/core/iwasm/common/wasm_runtime_common.c:1476
    #9 0x555555a696b5 in wasm_runtime_load wasm-micro-runtime/core/iwasm/common/wasm_runtime_common.c:1568
    #10 0x5555557a88c0 in main wasm-micro-runtime/wamr-compiler/main.c:840
    #11 0x7ffff7629d8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

SUMMARY: AddressSanitizer: 24 byte(s) leaked in 1 allocation(s).

Desktop:

• Arch [x86_64]
• OS [Linux]
• Version [Ubuntu 22.04]