btrfs: Define submit_bio_hook's type directly
There is no need to use a typedef to define the type of the function and then use that to define the respective member in extent_io_ops. Define struct's member directly. No functional changes. Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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