btrfs: drop unused parameter data from btrfs_fill_super()

The only caller passes NULL, we can drop the parameter. This is since
the new mount option parser done in 3bb17a2 ("btrfs: add get_tree
callback for new mount API").

Reviewed-by: Anand Jain <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: kdave

fs/btrfs/super.c

@@ -946,8 +946,7 @@ static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objec
 }
 
 static int btrfs_fill_super(struct super_block *sb,
-			    struct btrfs_fs_devices *fs_devices,
-			    void *data)
+			    struct btrfs_fs_devices *fs_devices)
 {
 	struct inode *inode;
 	struct btrfs_fs_info *fs_info = btrfs_sb(sb);
@@ -1893,7 +1892,7 @@ static int btrfs_get_tree_super(struct fs_context *fc)
 		snprintf(sb->s_id, sizeof(sb->s_id), "%pg", bdev);
 		shrinker_debugfs_rename(sb->s_shrink, "sb-btrfs:%s", sb->s_id);
 		btrfs_sb(sb)->bdev_holder = &btrfs_fs_type;
-		ret = btrfs_fill_super(sb, fs_devices, NULL);
+		ret = btrfs_fill_super(sb, fs_devices);
 	}
 
 	if (ret) {