refact(cmd/cat): remove useless code
refact(cmd/cat): remove useless code

License: MIT
Signed-off-by: chenminjian <25111d9244e5ee1e3fa6711e9488696e1f4f0c7e@qq.com>

chriscool/go-ipfs,Luzifer/go-ipfs,chriscool/go-ipfs,Luzifer/go-ipfs,Luzifer/go-ipfs,chriscool/go-ipfs