The bat files can use "if" + parentheses to make it easier to
understand how the if-case is handled rather than the more cryptic
"if" + "goto".
While here, replace some "goto"s with direct "exit" calls.
Change-Id: I20e1804439b5088f8f1e5cbf8676f3d58560109d
Reviewed-on: https://go-review.googlesource.com/c/go/+/648375
Auto-Submit: Damien Neil <dneil@google.com> Reviewed-by: Damien Neil <dneil@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Cherry Mui <cherryyz@google.com>