btrfs: switch compression callbacks to direct calls
The indirect calls bring some overhead due to spectre vulnerability mitigations. The number of cases is small and below the threshold (10-20) where indirect call would be better. Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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