[mutter] gpu-kms: Fix mode ID type

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

commit e15bb68d8f17b4ac6b14fe412c2276d496c9533b
Author: Jonas Ådahl <jadahl gmail com>
Date:   Mon Jul 13 21:29:18 2020 +0200

    gpu-kms: Fix mode ID type
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1488>

 src/backends/native/meta-gpu-kms.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/backends/native/meta-gpu-kms.c b/src/backends/native/meta-gpu-kms.c
index 3587cf8fd1..9a76803d37 100644
--- a/src/backends/native/meta-gpu-kms.c
+++ b/src/backends/native/meta-gpu-kms.c
@@ -399,7 +399,7 @@ init_modes (MetaGpuKms *gpu_kms)
   GList *modes;
   GHashTableIter iter;
   drmModeModeInfo *drm_mode;
-  long mode_id;
+  uint64_t mode_id;
 
   /*
    * Gather all modes on all connected connectors.
@@ -442,7 +442,7 @@ init_modes (MetaGpuKms *gpu_kms)
     {
       MetaCrtcModeKms *mode;
 
-      mode = meta_crtc_mode_kms_new (drm_mode, (long) mode_id);
+      mode = meta_crtc_mode_kms_new (drm_mode, mode_id);
       modes = g_list_append (modes, mode);
 
       mode_id++;