- set debug messages after a TRACE_ON test

- prevent crash when making the NULL context current

dlls/opengl32/wgl.c

@@ -199,7 +199,9 @@ BOOL WINAPI wglMakeCurrent(HDC hdc,
   physDev =(X11DRV_PDEVICE *)dc->physDev;
 
   ENTER_GL();
-  ret = glXMakeCurrent(display, physDev->drawable, (GLXContext) hglrc);
+  ret = glXMakeCurrent(display,
+		       (hglrc == NULL ? None : physDev->drawable),
+		       (GLXContext) hglrc);
   LEAVE_GL();
   
   return ret;

graphics/x11drv/opengl.c

@@ -253,7 +253,9 @@ int X11DRV_DescribePixelFormat(DC *dc,
 
   ppfd->iLayerType = PFD_MAIN_PLANE;
   
-  dump_PIXELFORMATDESCRIPTOR(ppfd);
+  if (TRACE_ON(opengl)) {
+    dump_PIXELFORMATDESCRIPTOR(ppfd);
+  }
   
   return MAX_PIXELFORMATS;
 }