net/url: fail TestParseErrors test when getting an unwanted error

The TestParseErrors test function was not strict with unwanted errors
received from url.Parse(). It was not failing in such cases, now it does.

Change-Id: I18a26a68c1136f5c762989a76e04b47e33dd35f1
GitHub-Last-Rev: c33f984
GitHub-Pull-Request: #32954
Reviewed-on: https://go-review.googlesource.com/c/go/+/185080
Reviewed-by: Emmanuel Odeke <[email protected]>
Run-TryBot: Emmanuel Odeke <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>

Author: stefanb

src/net/url/url_test.go

@@ -1456,7 +1456,7 @@ func TestParseErrors(t *testing.T) {
 			continue
 		}
 		if err != nil {
-			t.Logf("Parse(%q) = %v; want no error", tt.in, err)
+			t.Errorf("Parse(%q) = %v; want no error", tt.in, err)
 		}
 	}
 }