btrfs: Remove find_raid56_stripe_len
find_raid56_stripe_len statically returns SZ_64K which equals BTRFS_STRIPE_LEN. It's sole caller is __btrfs_alloc_chunk and it assigns the return value to ai variable which is already set to BTRFS_STRIPE_LEN. So remove the function invocation altogether and remove the function itself. Also remove the variable since it's only aliasing BTRFS_STRIPE_LEN and use the define directly. Use the occassion to simplify the rounding down of stripe_size now that the value we want it to align is a power of 2. Signed-off-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NQu Wenruo <quwenruo.btrfs@gmx.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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