btrfs: move error handling code together in ctree.h

Looks like we added the incompatible defines in between the error
handling defines in the file ctree.h. Now group them back.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>