btrfs: simplify dir item location setup in btrfs_insert_xattr_item()

The location (a btrfs_disk_key) of a btrfs_dir_item used for a xattr is
always zeroed and we have a complex setup in btrfs_insert_xattr_item()
where we declare an on stack btrfs_key, zero it out, convert it into a
btrfs_disk_key, also declared on stack, and then pass that btrfs_disk_key
to a btrfs_set_dir_item_key() call.

We can simplify this, and save stack space (one btrfs_disk_key and one
btrfs_key), by simply using memzero_extent_buffer().

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

0 files changed, 0 insertions, 0 deletions