Stub display_present

dev/virtio/gpu/virtio-gpu.c

 /*
  * Copyright (c) 2014-2015 Travis Geiselbrecht
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files
  * (the "Software"), to deal in the Software without restriction,
  * including without limitation the rights to use, copy, modify, merge,
  * publish, distribute, sublicense, and/or sell copies of the Software,
  * and to permit persons to whom the Software is furnished to do so,
  * subject to the following conditions:
@@ skipping 572 matching lines @@
 
     if (!the_gdev)
         return ERR_NOT_FOUND;
 
     info->format = DISPLAY_FORMAT_RGB_x888;
     info->width = the_gdev->pmode.r.width;
     info->height = the_gdev->pmode.r.height;
 
     return NO_ERROR;
 }
+
+status_t display_present(struct display_image *image, uint starty, uint endy)
+{
+  TRACEF("display_present - not implemented");
+  DEBUG_ASSERT(false);
+  return NO_ERROR;
+}