minigbm: re-const-ify driver backends

minigbm driver creation needs to be re-entrant (see CL:674528). Let's
re-constify to make this behavior explicit.

BUG=none
TEST=emerge-eve {minigbm, arc-cros-gralloc}

Change-Id: I037966199d4aa6de60432127e10fea1fb602694b
Reviewed-on: https://chromium-review.googlesource.com/758142
Commit-Ready: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/rockchip.c b/rockchip.c
index 5fb0be4..2678f77 100644
--- a/rockchip.c
+++ b/rockchip.c
@@ -314,7 +314,7 @@ static uint32_t rockchip_resolve_format(uint32_t format, uint64_t use_flags)
 	}
 }
 
-struct backend backend_rockchip = {
+const struct backend backend_rockchip = {
 	.name = "rockchip",
 	.init = rockchip_init,
 	.bo_create = rockchip_bo_create,