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

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 >>)

quoted

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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