C: spell Brian's name correctly

R=iant, nigeltao
CC=golang-dev
https://golang.org/cl/6492102

CONTRIBUTORS

@@ -79,7 +79,7 @@ Blake Mizerany <blake.mizerany@gmail.com>
 Bobby Powers <bobbypowers@gmail.com>
 Brad Fitzpatrick <bradfitz@golang.org> <bradfitz@gmail.com>
 Brian Dellisanti <briandellisanti@gmail.com>
-Brian Slesinskya <skybrian@google.com>
+Brian Slesinsky <skybrian@google.com>
 Brendan O'Dea <bod@golang.org>
 Caine Tighe <arctanofyourface@gmail.com>
 Carlos Castillo <cookieo9@gmail.com>