arch/powerpc/platforms/cell/spufs/coredump.c:124 spufs_arch_write_note() warn: unsigned 'ret' is never less than zero.

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5b14671be58d0084e7e2d1cc9c2c36a94467f6e0
commit: 5456ffdee666c66e27ccc1006f9afe83ad55559f powerpc/spufs: simplify spufs core dumping
date:   5 weeks ago
config: powerpc-randconfig-m031-20200607 (attached as .config)
compiler: powerpc64-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

smatch warnings:
arch/powerpc/platforms/cell/spufs/coredump.c:124 spufs_arch_write_note() warn: unsigned 'ret' is never less than zero.

vim +/ret +124 arch/powerpc/platforms/cell/spufs/coredump.c

   101	
   102	static int spufs_arch_write_note(struct spu_context *ctx, int i,
   103					  struct coredump_params *cprm, int dfd)
   104	{
   105		size_t sz = spufs_coredump_read[i].size;
   106		char fullname[80];
   107		struct elf_note en;
   108		size_t ret;
   109	
   110		sprintf(fullname, "SPU/%d/%s", dfd, spufs_coredump_read[i].name);
   111		en.n_namesz = strlen(fullname) + 1;
   112		en.n_descsz = sz;
   113		en.n_type = NT_SPU;
   114	
   115		if (!dump_emit(cprm, &en, sizeof(en)))
   116			return -EIO;
   117		if (!dump_emit(cprm, fullname, en.n_namesz))
   118			return -EIO;
   119		if (!dump_align(cprm, 4))
   120			return -EIO;
   121	
   122		if (spufs_coredump_read[i].dump) {
   123			ret = spufs_coredump_read[i].dump(ctx, cprm);
 > 124			if (ret < 0)
   125				return ret;
   126		} else {
   127			char buf[32];
   128	
   129			ret = snprintf(buf, sizeof(buf), "0x%.16llx",
   130				       spufs_coredump_read[i].get(ctx));
   131			if (ret >= sizeof(buf))
   132				return sizeof(buf);
   133	
   134			/* count trailing the NULL: */
   135			if (!dump_emit(cprm, buf, ret + 1))
   136				return -EIO;
   137		}
   138	
   139		if (!dump_skip(cprm, roundup(cprm->pos - ret + sz, 4) - cprm->pos))
   140			return -EIO;
   141		return 0;
   142	}
   143	

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