[mutter] renderer/native: Get bpp from gbm_bo

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

commit bece36b4adc5d9c018b29813ad6a4962952c3a37
Author: Jonas Ådahl <jadahl gmail com>
Date:   Mon May 3 23:41:56 2021 +0200

    renderer/native: Get bpp from gbm_bo
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1854>

 src/backends/native/meta-renderer-native.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/backends/native/meta-renderer-native.c b/src/backends/native/meta-renderer-native.c
index e1f6e08523..70fd51a9fd 100644
--- a/src/backends/native/meta-renderer-native.c
+++ b/src/backends/native/meta-renderer-native.c
@@ -814,7 +814,7 @@ meta_renderer_native_create_dma_buf (CoglRenderer  *cogl_renderer,
 
         stride = gbm_bo_get_stride (new_bo);
         offset = gbm_bo_get_offset (new_bo, 0);
-        bpp = 4;
+        bpp = gbm_bo_get_bpp (new_bo) / 8;
         dmabuf_fb =
           meta_renderer_native_create_dma_buf_framebuffer (renderer_native,
                                                            dmabuf_fd,