Commita5f2c45528("Huffman ASM") added a new ASM source file, but it wasn't added to the kernel Makefile despite that it received support for Huffman ASM according to the internal definitions. This leads to undefined references, as huf_decompress.o now calls those ASM functions. Add it to the list of sources when building inside the kernel tree. Kbuild can handle .S files just fine, so none additional rules needed. Fixes:a5f2c45528("Huffman ASM") Signed-off-by: Alexander Lobakin <alobakin@pm.me>