gofmt: gofmt -s -w src misc

R=r, bradfitzwork
CC=golang-dev
https://golang.org/cl/4406044
diff --git a/src/pkg/syscall/syscall_plan9.go b/src/pkg/syscall/syscall_plan9.go
index b889940..831cbdd 100644
--- a/src/pkg/syscall/syscall_plan9.go
+++ b/src/pkg/syscall/syscall_plan9.go
@@ -52,7 +52,7 @@
 }
 
 func cstring(s []byte) string {
-	for i, _ := range s {
+	for i := range s {
 		if s[i] == 0 {
 			return string(s[0:i])
 		}