drivers/hwtracing/coresight/coresight-tpdm.c:288 dsb_mode_store() warn: unsigned 'val' is never less than zero.

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   eca631b8fe808748d7585059c4307005ca5c5820
commit: 018e43ad1eeefbb8797e4c933953c50c09e3f4f6 coresight-tpdm: Add node to set dsb programming mode
date:   11 months ago
config: arm-randconfig-r073-20241015 (https://download.01.org/0day-ci/archive/20241015/202410150702.UaZ7kvet-lkp@xxxxxxxxx/config)
compiler: arm-linux-gnueabi-gcc (GCC) 14.1.0

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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410150702.UaZ7kvet-lkp@xxxxxxxxx/

smatch warnings:
drivers/hwtracing/coresight/coresight-tpdm.c:288 dsb_mode_store() warn: unsigned 'val' is never less than zero.

vim +/val +288 drivers/hwtracing/coresight/coresight-tpdm.c

   279	
   280	static ssize_t dsb_mode_store(struct device *dev,
   281				      struct device_attribute *attr,
   282				      const char *buf,
   283				      size_t size)
   284	{
   285		struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
   286		unsigned long val;
   287	
 > 288		if ((kstrtoul(buf, 0, &val)) || (val < 0) ||
   289				(val & ~TPDM_DSB_MODE_MASK))
   290			return -EINVAL;
   291	
   292		spin_lock(&drvdata->spinlock);
   293		drvdata->dsb->mode = val & TPDM_DSB_MODE_MASK;
   294		spin_unlock(&drvdata->spinlock);
   295		return size;
   296	}
   297	static DEVICE_ATTR_RW(dsb_mode);
   298	

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