strconv: apply Brad's review comment

Missed in CL 49253 because I submitted from the Gerrit UI and
had not mailed the latest copy. Sigh.

Change-Id: I540f960278df43e2eaf1aac188eb124a1ff240dd
Reviewed-on: https://go-review.googlesource.com/49256
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>

src/strconv/atof_test.go

@@ -221,10 +221,10 @@ var (
 )
 
 func initAtof() {
-	atofOnce.Do(initAtof1)
+	atofOnce.Do(initAtofOnce)
 }
 
-func initAtof1() {
+func initAtofOnce() {
 	// The atof routines return NumErrors wrapping
 	// the error and the string. Convert the table above.
 	for i := range atoftests {