btrfs: remove trivial wrapper btrfs_read_buffer()
The function btrfs_read_buffer() is useless, it just calls btree_read_extent_buffer_pages() with exactly the same arguments. So remove it and rename btree_read_extent_buffer_pages() to btrfs_read_extent_buffer(), which is a shorter name, has the "btrfs_" prefix (since it's used outside disk-io.c) and the name is clear enough about what it does. Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NFilipe Manana <fdmanana@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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