runtime: gofmt

Add new line at the end of crash_test.go.

Change-Id: I73c77666066b105e563215f34e7ede6c1d92226b
Reviewed-on: https://go-review.googlesource.com/c/go/+/422299
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

src/runtime/crash_test.go

@@ -851,4 +851,4 @@ func TestPanicOnUnsafeSlice(t *testing.T) {
 	if !strings.Contains(output, want) {
 		t.Errorf("output does not contain %q:\n%s", want, output)
 	}
-}
+}