net/ipv4/inet_diag.c:1511:17: sparse: sparse: Using plain integer as NULL pointer

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   da4373fbcf006deda90e5e6a87c499e0ff747572
commit: 223f55196bbdb182a9b8de6108a0834b5e5e832e inet_diag: allow concurrent operations
date:   10 months ago
config: hexagon-randconfig-r112-20241109 (https://download.01.org/0day-ci/archive/20241109/202411091538.PGSTqUBi-lkp@xxxxxxxxx/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713)
reproduce: (https://download.01.org/0day-ci/archive/20241109/202411091538.PGSTqUBi-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411091538.PGSTqUBi-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> net/ipv4/inet_diag.c:1511:17: sparse: sparse: Using plain integer as NULL pointer

vim +1511 net/ipv4/inet_diag.c

  1503	
  1504	int inet_diag_register(const struct inet_diag_handler *h)
  1505	{
  1506		const __u16 type = h->idiag_type;
  1507	
  1508		if (type >= IPPROTO_MAX)
  1509			return -EINVAL;
  1510	
> 1511		return !cmpxchg((const struct inet_diag_handler **)&inet_diag_table[type],
  1512				NULL, h) ? 0 : -EEXIST;
  1513	}
  1514	EXPORT_SYMBOL_GPL(inet_diag_register);
  1515	

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