btrfs: make get_state_failrec return failrec directly
Only failure that get_state_failrec can get is if there is no failure for the given address. There is no reason why the function should return a status code and use a separate parameter for returning the actual failure rec (if one is found). Simplify it by making the return type a pointer and return ERR_PTR value in case of errors. 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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