drm_syncobj: switch to fdget()

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

drivers/gpu/drm/drm_syncobj.c

@@ -388,20 +388,19 @@ static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
 				    int fd, u32 *handle)
 {
 	struct drm_syncobj *syncobj;
-	struct file *file;
+	struct fd f = fdget(fd);
 	int ret;
 
-	file = fget(fd);
-	if (!file)
+	if (!f.file)
 		return -EINVAL;
 
-	if (file->f_op != &drm_syncobj_file_fops) {
-		fput(file);
+	if (f.file->f_op != &drm_syncobj_file_fops) {
+		fdput(f);
 		return -EINVAL;
 	}
 
 	/* take a reference to put in the idr */
-	syncobj = file->private_data;
+	syncobj = f.file->private_data;
 	drm_syncobj_get(syncobj);
 
 	idr_preload(GFP_KERNEL);
@@ -416,7 +415,7 @@ static int drm_syncobj_fd_to_handle(struct drm_file *file_private,
 	} else
 		drm_syncobj_put(syncobj);
 
-	fput(file);
+	fdput(f);
 	return ret;
 }