This code was first introduced in 31db9f7c ("Btrfs: introduce
BTRFS_IOC_SEND for btrfs send/receive") and it was not functional, then
it got slightly refactored in e938c8ad ("Btrfs: code cleanups for
send/receive"), alas it was still dead. So let's remove it for good!
Signed-off-by: NNikolay Borisov <nborisov@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>