mfd: Use sysfs_emit() to instead of scnprintf()

Follow the advice of the Documentation/filesystems/sysfs.rst and show()
should only use sysfs_emit() or sysfs_emit_at() when formatting the
value to be returned to user space.

Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/202212021528368292334@zte.com.cn

drivers/mfd/kempld-core.c

@@ -349,7 +349,7 @@ static ssize_t pld_version_show(struct device *dev,
 {
 	struct kempld_device_data *pld = dev_get_drvdata(dev);
 
-	return scnprintf(buf, PAGE_SIZE, "%s\n", pld->info.version);
+	return sysfs_emit(buf, "%s\n", pld->info.version);
 }
 
 static ssize_t pld_specification_show(struct device *dev,
@@ -357,8 +357,7 @@ static ssize_t pld_specification_show(struct device *dev,
 {
 	struct kempld_device_data *pld = dev_get_drvdata(dev);
 
-	return scnprintf(buf, PAGE_SIZE, "%d.%d\n", pld->info.spec_major,
-		       pld->info.spec_minor);
+	return sysfs_emit(buf, "%d.%d\n", pld->info.spec_major, pld->info.spec_minor);
 }
 
 static ssize_t pld_type_show(struct device *dev,
@@ -366,7 +365,7 @@ static ssize_t pld_type_show(struct device *dev,
 {
 	struct kempld_device_data *pld = dev_get_drvdata(dev);
 
-	return scnprintf(buf, PAGE_SIZE, "%s\n", kempld_get_type_string(pld));
+	return sysfs_emit(buf, "%s\n", kempld_get_type_string(pld));
 }
 
 static DEVICE_ATTR_RO(pld_version);

drivers/mfd/lm3533-core.c

@@ -286,7 +286,7 @@ static ssize_t show_output(struct device *dev,
 
 	val = (val & mask) >> shift;
 
-	return scnprintf(buf, PAGE_SIZE, "%u\n", val);
+	return sysfs_emit(buf, "%u\n", val);
 }
 
 static ssize_t store_output(struct device *dev,