more work on Raw -> Smart Pointers for external libs.

src/external/MusrRoot/TMusrRunHeader.cpp

@@ -1507,7 +1507,7 @@ bool TMusrRunHeader::UpdateFolder(TObject *treeObj, TString path)
 
   if (!obj) { // required object not present, create it
     TObjArray *oarray = new TObjArray();
-    if (!oarray) {
+    if (oarray == nullptr) {
       std::cerr << std::endl << ">> TMusrRunHeader::UpdateFolder(): **ERROR** couldn't create header structure!!" << std::endl;
       return false;
     }