Hi Sven,

[auto build test ERROR on linus/master]
[also build test ERROR on next-20161221]
[cannot apply to v4.9]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Sven-Schmidt/Update-LZ4-compressor-module/20161221-130109
config: x86_64-randconfig-x004-201651 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

Note: the linux-review/Sven-Schmidt/Update-LZ4-compressor-module/20161221-130109 HEAD 08652114d6d8867d2e8b3545b5e9f8a2fe11a5d7 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   fs/squashfs/lz4_wrapper.c: In function 'lz4_uncompress':
>> fs/squashfs/lz4_wrapper.c:111:8: error: implicit declaration of function 'LZ4_decompress_safe' [-Werror=implicit-function-declaration]
     res = LZ4_decompress_safe(stream->input, stream->output, length, (int)dest_len);
           ^~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/LZ4_decompress_safe +111 fs/squashfs/lz4_wrapper.c

   105			buff += avail;
   106			bytes -= avail;
   107			offset = 0;
   108			put_bh(bh[i]);
   109		}
   110	
 > 111		res = LZ4_decompress_safe(stream->input, stream->output, length, (int)dest_len);
   112		if (res)
   113			return -EIO;
   114	

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