drm/ast: Remove unnecessary NULL check in bo_unref

ttm_bo_unref unconditionally calls kref_put on it's argument, so the
thing can't be NULL without already causing Oopses.

Spotted by coverity.

Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index 50535fd5a88d..38941a656312 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -411,10 +411,9 @@ static void ast_bo_unref(struct ast_bo **bo)
 
         tbo = &((*bo)->bo);
         ttm_bo_unref(&tbo);
-        if (tbo == NULL)
-                *bo = NULL;
-
+        *bo = NULL;
 }
+
 void ast_gem_free_object(struct drm_gem_object *obj)
 {
         struct ast_bo *ast_bo = gem_to_ast_bo(obj);