hash/crc64: use t.Fatalf in TestGolden
hash/crc64: use t.Fatalf in TestGolden

Use t.Fatalf instead of t.Errorf followed by t.FailNow.

Change-Id: Ie31f8006e7d9daca7f59bf6f0d5ae688222be486
Reviewed-on: https://go-review.googlesource.com/c/144111
Run-TryBot: Tobias Klauser <0a68dd4915066ec5d3f81f75a828fee53dcc8822@gmail.com>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

akutz/go,cloudflare/go,akutz/go,josharian/go,cloudflare/go,akutz/go,nawawi/go,golang/go,josharian/go,CAFxX/go,akutz/go,nawawi/go,golang/go,josharian/go,josharian/go,nawawi/go,nawawi/go,nawawi/go,josharian/go,golang/go,CAFxX/go,akutz/go,nawawi/go,cloudflare/go,golang/go,cloudflare/go,golang/go,golang/go,josharian/go,nawawi/go,CAFxX/go,nawawi/go,CAFxX/go,CAFxX/go,cloudflare/go,CAFxX/go,cloudflare/go,akutz/go,golang/go,cloudflare/go,josharian/go,cloudflare/go,CAFxX/go,CAFxX/go,golang/go,josharian/go,akutz/go,akutz/go