apply some code analyzer recommendations

libs/qt/qcd_core.cpp

@@ -140,7 +140,7 @@ bool QCDCore::bindWidget(QWidget * w) {
 		return false;
 	}
 	PIVector<CDType *> ak = K.root().children();
-	piForeachC(CDType * k, ak) {
+	for (const auto * k: ak) {
 		if (!on.endsWith(PI2QString(k->pathString().join("_")))) continue;
 		if (bindWidget(w, *k)) return true;
 	}