Fix: Fix null pointer dereference in wasm_c_api.c #10387

Job	Run time
build_llvm_libraries_on_windows / build_llvm_libraries	21s
build_iwasm (-DWAMR_BUILD_AOT=1 -DWAMR_BUILD_INTERP=0)	1m 10s
build_iwasm (-DWAMR_BUILD_REF_TYPES=1)	1m 23s
build_iwasm (-DWAMR_BUILD_LIBC_UVWASI=0 -DWAMR_BUILD_LIBC_WASI=1)	1m 12s
build_iwasm (-DWAMR_DISABLE_HW_BOUND_CHECK=1)	1m 9s
build_iwasm (-DWAMR_BUILD_TAIL_CALL=1)	1m 21s
build_iwasm (-DWAMR_BUILD_AOT=0)	1m 8s
build_iwasm (-DWAMR_BUILD_CUSTOM_NAME_SECTION=1)	1m 17s
build_iwasm (-DWAMR_BUILD_LIB_PTHREAD=1)	1m 25s
build_iwasm (-DWAMR_BUILD_DEBUG_INTERP=1)	1m 21s
build_iwasm (-DWAMR_BUILD_LIB_WASI_THREADS=1)	1m 20s
build_wamrc (windows-2022, 0-llvm-libraries-windows-2022-AArch64 ARM Mips RISCV X86-3b5b5c1ec4a30...	1m 42s
test (fast-interp, $WASI_TEST_OPTIONS)	2m 11s
test (fast-interp, $MULTI_MODULES_TEST_OPTIONS)	5m 43s
test (classic-interp, $THREADS_TEST_OPTIONS)	3m 3s
test (classic-interp, $MULTI_MODULES_TEST_OPTIONS)	5m 40s
test (classic-interp, $DEFAULT_TEST_OPTIONS)	4m 21s
test (fast-interp, $DEFAULT_TEST_OPTIONS)	4m 39s
test (fast-interp, $THREADS_TEST_OPTIONS)	3m 4s
test (classic-interp, $WASI_TEST_OPTIONS)	4m 20s
	47m 50s

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