Fix LibreOffice running with SAL_ENABLEGL=1

Change-Id: I302ab9e38831403cbb4aa96c61d4862f43537e8e

vcl/unx/generic/gdi/salvd.cxx

@@ -42,7 +42,10 @@ SalVirtualDevice* X11SalInstance::CreateX11VirtualDevice(SalGraphics* pGraphics,
     if (OpenGLHelper::isVCLOpenGLEnabled())
         return new X11OpenGLSalVirtualDevice( pGraphics, nDX, nDY, nBitCount, pData );
     else
+    {
+        assert(pNewGraphics);
         return new X11SalVirtualDevice(pGraphics, nDX, nDY, nBitCount, pData, pNewGraphics);
+    }
 }
 
 SalVirtualDevice* X11SalInstance::CreateVirtualDevice(SalGraphics* pGraphics,

vcl/unx/gtk/app/gtkinst.cxx

@@ -322,9 +322,12 @@ SalVirtualDevice* GtkInstance::CreateVirtualDevice( SalGraphics *pG,
     return pNew;
 #else
     GtkSalGraphics *pGtkSalGraphics = dynamic_cast<GtkSalGraphics*>(pG);
-    assert(pGtkSalGraphics);
-    return CreateX11VirtualDevice(pG, nDX, nDY, nBitCount, pGd,
-            new GtkSalGraphics(pGtkSalGraphics->GetGtkFrame(), pGtkSalGraphics->GetGtkWidget()));
+
+    GtkSalGraphics *pNewGraphics = NULL;
+    if (pGtkSalGraphics)
+        pNewGraphics = new GtkSalGraphics(pGtkSalGraphics->GetGtkFrame(), pGtkSalGraphics->GetGtkWidget());
+
+    return CreateX11VirtualDevice(pG, nDX, nDY, nBitCount, pGd, pNewGraphics);
 #endif
 }