gofmt: gofmt -s -w src misc

R=r, bradfitzwork
CC=golang-dev
https://golang.org/cl/4406044
diff --git a/src/pkg/syscall/exec_windows.go b/src/pkg/syscall/exec_windows.go
index 1fa224e..aeee191 100644
--- a/src/pkg/syscall/exec_windows.go
+++ b/src/pkg/syscall/exec_windows.go
@@ -269,7 +269,7 @@
 
 	p, _ := GetCurrentProcess()
 	fd := make([]int32, len(attr.Files))
-	for i, _ := range attr.Files {
+	for i := range attr.Files {
 		if attr.Files[i] > 0 {
 			err := DuplicateHandle(p, int32(attr.Files[i]), p, &fd[i], 0, true, DUPLICATE_SAME_ACCESS)
 			if err != 0 {