drm/v3d: Use v3d_perfmon_find()

Replace the open-coded v3d_perfmon_find() with the real thing.

Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Reviewed-by: Maíra Canal <mcanal@igalia.com>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240923152000.185980-1-christian.gmeiner@gmail.com

drivers/gpu/drm/v3d/v3d_perfmon.c

@@ -402,11 +402,7 @@ int v3d_perfmon_get_values_ioctl(struct drm_device *dev, void *data,
 	if (req->pad != 0)
 		return -EINVAL;
 
-	mutex_lock(&v3d_priv->perfmon.lock);
-	perfmon = idr_find(&v3d_priv->perfmon.idr, req->id);
-	v3d_perfmon_get(perfmon);
-	mutex_unlock(&v3d_priv->perfmon.lock);
-
+	perfmon = v3d_perfmon_find(v3d_priv, req->id);
 	if (!perfmon)
 		return -EINVAL;