net: really skip Windows PTR tests if we say we are skipping them

For #38111

Change-Id: I2651687367af68ee070ea91106f4bc18adab2762
Reviewed-on: https://go-review.googlesource.com/c/go/+/414634
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

src/net/lookup_windows_test.go

@@ -156,7 +156,7 @@ func TestLookupLocalPTR(t *testing.T) {
 	}
 	expected, err := lookupPTR(addr.String())
 	if err != nil {
-		t.Logf("skipping failed lookup %s test: %s", addr.String(), err)
+		t.Skipf("skipping failed lookup %s test: %s", addr.String(), err)
 	}
 	sort.Strings(expected)
 	sort.Strings(names)
@@ -179,6 +179,7 @@ func TestLookupPTR(t *testing.T) {
 		expected, err := lookupPTR(addr)
 		if err != nil {
 			t.Logf("skipping failed lookup %s test: %s", addr, err)
+			continue
 		}
 		sort.Strings(expected)
 		sort.Strings(names)