mm/memory-failure: replace sprintf() with sysfs_emit()

As Documentation/filesystems/sysfs.rst suggested, show() should only use
sysfs_emit() or sysfs_emit_at() when formatting the value to be returned
to user space.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: zhangguopeng <[email protected]>
Acked-by: Miaohe Lin <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: zhangguopeng

mm/memory-failure.c

@@ -100,7 +100,7 @@ static ssize_t _name##_show(struct device *dev,			\
 {								\
 	struct memory_failure_stats *mf_stats =			\
 		&NODE_DATA(dev->id)->mf_stats;			\
-	return sprintf(buf, "%lu\n", mf_stats->_name);		\
+	return sysfs_emit(buf, "%lu\n", mf_stats->_name);	\
 }								\
 static DEVICE_ATTR_RO(_name)