fix for compiler warning

src/lib/ebus/test/test_data.cpp

@@ -568,7 +568,8 @@ int main() {
     }
     TestReader reader{templates, isSet, mstr[1] == BROADCAST || isMaster(mstr[1])};
     lineNo = 0;
-    dummystr = istringstream("#");
+    dummystr.clear();
+    dummystr.str("#");
     result = reader.readLineFromStream(dummystr, errorDescription, "inline", lineNo, row);
     if (result != RESULT_OK) {
       cout << "\"" << check[0] << "\": reader header error: " << getResultCode(result) << ", " << errorDescription

src/lib/ebus/test/test_message.cpp

@@ -146,7 +146,8 @@ int main() {
   templates->readLineFromStream(dummystr, errorDescription, "inline", lineNo, row, false);
   lineNo = 0;
   MessageMap* messages = new MessageMap();
-  dummystr = istringstream("#");
+  dummystr.clear();
+  dummystr.str("#");
   messages->readLineFromStream(dummystr, errorDescription, "inline", lineNo, row, false);
   vector< vector<string> > defaultsRows;
   Message* message = NULL;