btrfs: remove unused parameter blocksize from btrfs_find_tree_block

Signed-off-by: David Sterba <dsterba@suse.cz>

diff --cc fs/btrfs/ctree.c
Simple merge

diff --cc fs/btrfs/disk-io.c
Simple merge

diff --cc fs/btrfs/disk-io.h
Simple merge

diff --cc fs/btrfs/extent-tree.c
Simple merge