drm/amdgpu: Use kvzalloc() to simplify code

kvzalloc() can be used instead of kvmalloc() + memset() + explicit NULL
assignments.

It is less verbose and more future proof.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c

@@ -78,17 +78,13 @@ int amdgpu_bo_list_create(struct amdgpu_device *adev, struct drm_file *filp,
 	unsigned i;
 	int r;
 
-	list = kvmalloc(struct_size(list, entries, num_entries), GFP_KERNEL);
+	list = kvzalloc(struct_size(list, entries, num_entries), GFP_KERNEL);
 	if (!list)
 		return -ENOMEM;
 
 	kref_init(&list->refcount);
-	list->gds_obj = NULL;
-	list->gws_obj = NULL;
-	list->oa_obj = NULL;
 
 	array = list->entries;
-	memset(array, 0, num_entries * sizeof(struct amdgpu_bo_list_entry));
 
 	for (i = 0; i < num_entries; ++i) {
 		struct amdgpu_bo_list_entry *entry;