[mutter] backends/native: Remove unneeded NULL check

[Marge Bot <marge-bot src gnome org>]

commit 5a0d3ed4dd53c41abb3dc86b9b9759423e337ea6
Author: Ivan Molodetskikh <yalterz gmail com>
Date:   Tue Jul 6 07:42:30 2021 +0300

    backends/native: Remove unneeded NULL check
    
    There seems to be no way to construct this type with an invalid bo.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1762>

 src/backends/native/meta-drm-buffer-gbm.c | 7 -------
 1 file changed, 7 deletions(-)
---
diff --git a/src/backends/native/meta-drm-buffer-gbm.c b/src/backends/native/meta-drm-buffer-gbm.c
index 6bdc9995a9..5273cb520f 100644
--- a/src/backends/native/meta-drm-buffer-gbm.c
+++ b/src/backends/native/meta-drm-buffer-gbm.c
@@ -227,13 +227,6 @@ meta_drm_buffer_gbm_blit_to_framebuffer (CoglScanout      *scanout,
   int dmabuf_fd = -1;
   uint32_t i;
 
-  if (!buffer_gbm->bo)
-    {
-      g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
-                   "No gbm_bo available");
-      return FALSE;
-    }
-
   dmabuf_fd = gbm_bo_get_fd (buffer_gbm->bo);
   if (dmabuf_fd == -1)
     {