Fix export to dxf.

--HG--
branch : develop

src/app/valentina/mainwindowsnogui.cpp

@@ -795,10 +795,12 @@ void MainWindowsNoGUI::DxfFile(const QString &name, int i) const
         }
 
         QPainter painter;
-        painter.begin(&generator);
+        if (painter.begin(&generator))
+        {
             scenes.at(i)->render(&painter, paper->rect(), paper->rect(), Qt::IgnoreAspectRatio);
             painter.end();
         }
+    }
 }
 
 QT_WARNING_POP

src/libs/vdxf/dxflib/dl_dxf.cpp

@@ -2549,8 +2549,9 @@ void DL_Dxf::endSequence(DL_CreationInterface* creationInterface)
  */
 DL_WriterA* DL_Dxf::out(const char* file, DL_Codes::version version)
 {
-    char* f = new char[strlen(file)+1];
-    strlcpy(f, file, sizeof(f));
+    const int size = strlen(file)+1;
+    char* f = new char[size];
+    strlcpy(f, file, size); // Strange thing the sizeof(f) doesn't return correct value
     this->version = version;
 
     DL_WriterA* dw = new DL_WriterA(f, version);