btrfs: return ptr error from compression workspace
The btrfs compression wrappers translated errors from workspace allocation to either -ENOMEM or -1. The compression type workspace allocators are already returning a ERR_PTR(-ENOMEM). Just return that and get rid of the magical -1. This helps a future patch return errors from the compression wrappers. Signed-off-by: NZach Brown <zab@redhat.com> Reviewed-by: NDavid Sterba <dsterba@suse.cz> Signed-off-by: NChris Mason <clm@fb.com>
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