Misc. bug: the output file of llama-quantize is not gguf format

[samsosu]

Name and Version

./llama-cli --version
ggml_cuda_init: GGML_CUDA_FORCE_MMQ: no
ggml_cuda_init: GGML_CUDA_FORCE_CUBLAS: no
ggml_cuda_init: found 1 CUDA devices:
Device 0: NVIDIA A10, compute capability 8.6, VMM: yes
version: 5225 (a0f7016)
built with cc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0 for x86_64-linux-gnu

Operating systems

Linux

Which llama.cpp modules do you know to be affected?

llama-quantize

Command line

cd build/bin
./llama-quantize /mnt/data/train_output/Qwen2.5-32B-f16.gguf /mnt/data/train_output/Qwen2.5-32B-Q4_K_M.gguf Q4_K_M

Problem description & steps to reproduce

the quantize process has been finished successfully. but the output file can not be loaded by the following command:
./llama-cli -m /mnt/data/train_output/Qwen2.5-32B-Q4_K_M.gguf -n 128 --color -ngl 35

the error response like this:
gguf_init_from_file_impl: invalid magic characters: '', expected 'GGUF'
llama_model_load: error loading model: llama_model_loader: failed to load model from /mnt/data/train_output/Qwen2.5-32B-Q4_K_M.gguf

llama_model_load_from_file_impl: failed to load model
common_init_from_params: failed to load model '/mnt/data/train_output/Qwen2.5-32B-Q4_K_M.gguf'
main: error: unable to load model

And I check the header data of this gguf file, find out there is not GGUF header, there is a lot of zero bytes at the beginning of gguf file

I also checked the source code of quantize.cpp，there is no code about outputing gguf format header at all.

First Bad Commit

No response

Relevant log output