perf/core: Use sysfs_emit() instead of scnprintf()

Follow the advice in Documentation/filesystems/sysfs.rst:

  "- show() should only use sysfs_emit() or sysfs_emit_at() when formatting
     the value to be returned to user space."

No change in functionality intended.

[ mingo: Updated the changelog ]

Signed-off-by: XieLudan <xie.ludan@zte.com.cn>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250315141738452lXIH39UJAXlCmcATCzcBv@zte.com.cn

kernel/events/core.c

@@ -11713,7 +11713,7 @@ static ssize_t nr_addr_filters_show(struct device *dev,
 {
 	struct pmu *pmu = dev_get_drvdata(dev);
 
-	return scnprintf(page, PAGE_SIZE - 1, "%d\n", pmu->nr_addr_filters);
+	return sysfs_emit(page, "%d\n", pmu->nr_addr_filters);
 }
 DEVICE_ATTR_RO(nr_addr_filters);
 
@@ -11724,7 +11724,7 @@ type_show(struct device *dev, struct device_attribute *attr, char *page)
 {
 	struct pmu *pmu = dev_get_drvdata(dev);
 
-	return scnprintf(page, PAGE_SIZE - 1, "%d\n", pmu->type);
+	return sysfs_emit(page, "%d\n", pmu->type);
 }
 static DEVICE_ATTR_RO(type);
 
@@ -11735,7 +11735,7 @@ perf_event_mux_interval_ms_show(struct device *dev,
 {
 	struct pmu *pmu = dev_get_drvdata(dev);
 
-	return scnprintf(page, PAGE_SIZE - 1, "%d\n", pmu->hrtimer_interval_ms);
+	return sysfs_emit(page, "%d\n", pmu->hrtimer_interval_ms);
 }
 
 static DEFINE_MUTEX(mux_interval_mutex);