[jlayton:mgtime 8/13] kernel/time/timekeeping_debug.c:66 timekeeping_get_mg_floor_swaps() warn: unsigned 'sum' is never less than zero.

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git mgtime
head:   20490d956a00f097e09ed6d3073b6231aaa0195f
commit: 6135c3c69350e84fa9c43b8c1b23a3f61bebe852 [8/13] timekeeping: add percpu counter for tracking floor swap events
config: i386-randconfig-141-20240924 (https://download.01.org/0day-ci/archive/20240924/202409241549.UDfBa14A-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0

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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409241549.UDfBa14A-lkp@intel.com/

smatch warnings:
kernel/time/timekeeping_debug.c:66 timekeeping_get_mg_floor_swaps() warn: unsigned 'sum' is never less than zero.

vim +/sum +66 kernel/time/timekeeping_debug.c

    58	
    59	unsigned long timekeeping_get_mg_floor_swaps(void)
    60	{
    61		int i;
    62		unsigned long sum = 0;
    63	
    64		for_each_possible_cpu(i)
    65			sum += per_cpu(timekeeping_mg_floor_swaps, i);
  > 66		return sum < 0 ? 0 : sum;
    67	}
    68	

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