Fix coverity reports #32499 & #32500 (uninitialized scalar variables)

git-svn-id: http://root.cern.ch/svn/root/trunk@41272 27541ba8-7e3a-0410-8455-c3a389f83636

gui/qtgsi/src/TQCanvasMenu.cxx

@@ -223,7 +223,7 @@ void TQCanvasMenu::Dialog(TObject* object, TMethod* method)
          }
          else if (!strncmp(basictype, "float", 5) ||
             !strncmp(basictype, "double", 6)) {
-            Double_t ddefval;
+            Double_t ddefval = 0.0;
             m->GetterMethod()->Execute(object, "", ddefval);
             snprintf(val, 255, "%g", ddefval);
          }
@@ -231,7 +231,7 @@ void TQCanvasMenu::Dialog(TObject* object, TMethod* method)
              !strncmp(basictype, "int", 3)  ||
              !strncmp(basictype, "long", 4) ||
              !strncmp(basictype, "short", 5)) {
-            Long_t ldefval;
+            Long_t ldefval = 0L;
             m->GetterMethod()->Execute(object, "", ldefval);
             snprintf(val, 255, "%li", ldefval);
          }