btrfs: Remove 'tree' argument from read_extent_buffer_pages
This function always uses the btree inode's io_tree. Stop taking the tree as a function argument and instead access it internally from read_extent_buffer_pages. 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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