[net-next:master 1587/1624] drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.c:43:47: sparse: Using plain integer as NULL pointer

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 
master
head:   85831e56a1d0c75a1560e61acbb8591e9f11c6b7
commit: 91c1953de38725d41cf9a677569a8cc280065064 [1587/1624] cxgb4: use zlib 
deflate to compress firmware dump
reproduce:
        # apt-get install sparse
        git checkout 91c1953de38725d41cf9a677569a8cc280065064
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.c:43:47: sparse: Using plain 
>> integer as NULL pointer

vim +43 drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.c

    38  
    39  int cudbg_compress_buff(struct cudbg_init *pdbg_init,
    40                          struct cudbg_buffer *pin_buff,
    41                          struct cudbg_buffer *pout_buff)
    42  {
  > 43          struct z_stream_s compress_stream = { 0 };

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