btrfs: fix error labels in init_btrfs_fs
btrfs_interface_init rarely fails but we could leak the prelim_ref slab.
Signed-off-by: NDavid Sterba <dsterba@suse.cz>
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btrfs_interface_init rarely fails but we could leak the prelim_ref slab.
Signed-off-by: NDavid Sterba <dsterba@suse.cz>