Fix more uses of T* conversion operator from scoped_refptr<T> which is now removed

ui/ozone/platform/dri/gbm_surface.cc

Index: ui/ozone/platform/dri/gbm_surface.cc
diff --git a/ui/ozone/platform/dri/gbm_surface.cc b/ui/ozone/platform/dri/gbm_surface.cc
index 53cd08f0150bd40bf67184b3b1f44d84c54af3f7..18d00e6eb7bee4fcde80d97cb75265bb15983311 100644
--- a/ui/ozone/platform/dri/gbm_surface.cc
+++ b/ui/ozone/platform/dri/gbm_surface.cc
@@ -135,9 +135,9 @@ bool GbmSurface::OnSwapBuffers() {
   gbm_bo* pending_buffer = gbm_surface_lock_front_buffer(native_surface_);
   scoped_refptr<GbmSurfaceBuffer> primary =
       GbmSurfaceBuffer::GetBuffer(pending_buffer);
-  if (!primary) {
+  if (!primary.get()) {
     primary = GbmSurfaceBuffer::CreateBuffer(dri_, pending_buffer);
-    if (!primary) {
+    if (!primary.get()) {
       LOG(ERROR) << "Failed to associate the buffer with the controller";
       return false;
     }