turning off diff's "No newline at end of file" warning

[jidanni]

Looking for a way to not be warned "\ No newline at end of file",
though one reads
(info "(diff)Incomplete Lines")
which leads one to try
(info "(diff)White Space")
still, the warning can't be turned off
$ diff -bw */使用說明:說明
1c1
< 本網站操作與[[wikipedia:zh:首頁|維基百科]]同。
\ No newline at end of file
---
> 本網站操作與[http://zh.wikipedia.org/wiki/首頁 維基百科]同。
\ No newline at end of file
Only -n seems to turn it off. But I don't want to use -n.
One could use 2>&-, but that is overkill.