delete duplicate return (#3267)

Signed-off-by: Abirdcfly <fp544037857@gmail.com>

Signed-off-by: Abirdcfly <fp544037857@gmail.com>

go/tools/releaser/file.go

diff --git a/go/tools/releaser/file.go b/go/tools/releaser/file.go
index 790ef51..e98fc1c 100644
--- a/go/tools/releaser/file.go
+++ b/go/tools/releaser/file.go
@@ -298,5 +298,4 @@
 	// cloud.google.com/go/storage because that package has a million
 	// dependencies.
 	return runForError(ctx, ".", "gsutil", "cp", "-n", fileName, dest)
-	return nil
 }