mtd: mtdpart: Convert sysfs sprintf/snprintf family to sysfs_emit

Use sysfs_emit instead of snprintf to avoid buf overrun,because in
sysfs_emit it strictly checks whether buf is null or buf whether
pagesize aligned, otherwise it returns an error.

Signed-off-by: Tian Tao <[e-mail]>
Signed-off-by: Miquel Raynal <[e-mail]>
Link: https://lore.kernel.org/linux-mtd/[e-mail]

drivers/mtd/mtdpart.c

···
 {
 	struct mtd_info *mtd = dev_get_drvdata(dev);
 
-	return snprintf(buf, PAGE_SIZE, "%lld\n", mtd->part.offset);
+	return sysfs_emit(buf, "%lld\n", mtd->part.offset);
 }
 
 static DEVICE_ATTR(offset, S_IRUGO, mtd_partition_offset_show, NULL);