ggml-cpu: Add bounds checking in make_block_q4_0x4 function

[ilhamsyahids]

Prevent potential buffer overflows by adding explicit bounds checking when copying memory in the make_block_q4_0x4 function

• fixes: Potentially buffer overflow in make_block_q4_0x4 #1094

after:

~/ggml/build$ cmake --build . --config Release -j 8
[  1%] Building CXX object examples/CMakeFiles/common.dir/common.cpp.o
[  2%] Building C object src/CMakeFiles/ggml-base.dir/ggml.c.o
[  3%] Building C object src/CMakeFiles/ggml-base.dir/ggml-alloc.c.o
[  4%] Building CXX object src/CMakeFiles/ggml-base.dir/ggml-backend.cpp.o
[  6%] Building CXX object src/CMakeFiles/ggml-base.dir/ggml-opt.cpp.o
[  6%] Building CXX object src/CMakeFiles/ggml-base.dir/ggml-threading.cpp.o
[  7%] Building C object src/CMakeFiles/ggml-base.dir/ggml-quants.c.o
[  8%] Building CXX object src/CMakeFiles/ggml-base.dir/gguf.cpp.o
[  9%] Linking CXX shared library libggml-base.so
[  9%] Built target ggml-base
[ 10%] Building CXX object src/CMakeFiles/ggml-cpu.dir/ggml-cpu/ggml-cpu.cpp.o
[ 11%] Building C object src/CMakeFiles/ggml-cpu.dir/ggml-cpu/ggml-cpu.c.o
[ 12%] Building CXX object src/CMakeFiles/ggml-cpu.dir/ggml-cpu/ggml-cpu-aarch64.cpp.o
[ 13%] Building CXX object src/CMakeFiles/ggml-cpu.dir/ggml-cpu/ggml-cpu-hbm.cpp.o
[ 14%] Building CXX object src/CMakeFiles/ggml-cpu.dir/ggml-cpu/ggml-cpu-traits.cpp.o
[ 15%] Building C object src/CMakeFiles/ggml-cpu.dir/ggml-cpu/ggml-cpu-quants.c.o
[ 16%] Building CXX object src/CMakeFiles/ggml-cpu.dir/ggml-cpu/amx/amx.cpp.o
[ 17%] Building CXX object src/CMakeFiles/ggml-cpu.dir/ggml-cpu/amx/mmq.cpp.o
[ 18%] Linking CXX static library libcommon.a
[ 18%] Built target common
[ 19%] Linking CXX shared library libggml-cpu.so
[ 19%] Built target ggml-cpu
[ 20%] Building CXX object src/CMakeFiles/ggml.dir/ggml-backend-reg.cpp.o
[ 21%] Linking CXX shared library libggml.so
[ 21%] Built target ggml
...

[slaren]

See #1094 (comment)

[ilhamsyahids]

I understand it could be potentially expensive checks, therefore I simplify it on 6bd5fb2

could you please check? @slaren