Remove check for negative length (#5120)

modules/user/user_test.go

@@ -18,7 +18,7 @@ func getWhoamiOutput() (string, error) {
 
 func TestCurrentUsername(t *testing.T) {
 	user := CurrentUsername()
-	if len(user) <= 0 {
+	if len(user) == 0 {
 		t.Errorf("expected non-empty user, got: %s", user)
 	}
 	// Windows whoami is weird, so just skip remaining tests