os: simplify check whether to run subtest of TestRemoveAll

Change-Id: Ic5b46cfb393f5ba7b91b3fb73b158b0bc238a532
GitHub-Last-Rev: e5c5db51bcc4848d807b0ce45e85c022492b2013
GitHub-Pull-Request: golang/go#30019
Reviewed-on: https://go-review.googlesource.com/c/go/+/160443
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/os/removeall_test.go

@@ -80,16 +80,8 @@ func TestRemoveAll(t *testing.T) {
 		t.Fatalf("Lstat %q succeeded after RemoveAll (third)", path)
 	}
 
-	// Determine if we should run the following test.
-	testit := true
-	if runtime.GOOS == "windows" {
-		// Chmod is not supported under windows.
-		testit = false
-	} else {
-		// Test fails as root.
-		testit = Getuid() != 0
-	}
-	if testit {
+	// Chmod is not supported under Windows and test fails as root.
+	if runtime.GOOS != "windows" && Getuid() != 0 {
 		// Make directory with file and subdirectory and trigger error.
 		if err = MkdirAll(dpath, 0777); err != nil {
 			t.Fatalf("MkdirAll %q: %s", dpath, err)