[PATCH v2] mtd: sm_ftl: replace strncpy with memcpy

[Rahul Kumar <rk0006818@gmail.com>]

Replace strncpy with memcpy in sm_attr_show and explicitly add a NUL
terminator after the copy. Also update the return value to reflect the
extra byte written for the terminator. This aligns with current kernel
best practices as strncpy is deprecated for such use, as explained in
Documentation/process/deprecated.rst.

No functional change, only cleanup for consistency.

Suggested-by: Pratyush Yadav <pratyush@kernel.org>
Signed-off-by: Rahul Kumar <rk0006818@gmail.com>
---
Changes in v1:
- Update return value to match the extra NUL written.
Link to v1: https://lore.kernel.org/all/mafs0ms7bvcd2.fsf@kernel.org/T/#t
---
 drivers/mtd/sm_ftl.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/sm_ftl.c b/drivers/mtd/sm_ftl.c
index d28d4f1790f5..3c5d6d0c728f 100644
--- a/drivers/mtd/sm_ftl.c
+++ b/drivers/mtd/sm_ftl.c
@@ -44,8 +44,9 @@ static ssize_t sm_attr_show(struct device *dev, struct device_attribute *attr,
 	struct sm_sysfs_attribute *sm_attr =
 		container_of(attr, struct sm_sysfs_attribute, dev_attr);
 
-	strncpy(buf, sm_attr->data, sm_attr->len);
-	return sm_attr->len;
+	memcpy(buf, sm_attr->data, sm_attr->len);
+	buf[sm_attr->len] = '\0';
+	return sm_attr->len + 1;
 }
 
 
-- 
2.43.0