misc/emacs: Kill gofmt error buffer if the buffer was formatted correctly already.
misc/emacs: Kill gofmt error buffer if the buffer was formatted correctly already.

R=adonovan, cw, patrick.allen.higgins, bradfitz
CC=golang-dev
https://codereview.appspot.com/7844045

Committer: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang