Fix missing return when validation fails in eglWaitNative. BUG=angleproject:2707 Change-Id: Ibd70437e3a40a9a63b78ac9a4546c97611a97ba5 Reviewed-on: https://chromium-review.googlesource.com/1126458 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>