drm/vmwgfx: Remove set but not used variable 'restart'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c: In function 'vmw_cmdbuf_work_func':
drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c:514:7: warning:
 variable 'restart' set but not used [-Wunused-but-set-variable]

It not used any more after commit dc366364 ("drm/vmwgfx: Fix multiple
command buffer context use")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Deepak Rawat <drawat@vmware.com>
Signed-off-by: Deepak Rawat <drawat@vmware.com>
Fixes: dc366364 ("drm/vmwgfx: Fix multiple command buffer context use")

drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c

@@ -511,17 +511,14 @@ static void vmw_cmdbuf_work_func(struct work_struct *work)
 		container_of(work, struct vmw_cmdbuf_man, work);
 	struct vmw_cmdbuf_header *entry, *next;
 	uint32_t dummy;
-	bool restart[SVGA_CB_CONTEXT_MAX];
 	bool send_fence = false;
 	struct list_head restart_head[SVGA_CB_CONTEXT_MAX];
 	int i;
 	struct vmw_cmdbuf_context *ctx;
 	bool global_block = false;
 
-	for_each_cmdbuf_ctx(man, i, ctx) {
+	for_each_cmdbuf_ctx(man, i, ctx)
 		INIT_LIST_HEAD(&restart_head[i]);
-		restart[i] = false;
-	}
 
 	mutex_lock(&man->error_mutex);
 	spin_lock(&man->lock);
@@ -533,7 +530,6 @@ static void vmw_cmdbuf_work_func(struct work_struct *work)
 		const char *cmd_name;
 
 		list_del_init(&entry->list);
-		restart[entry->cb_context] = true;
 		global_block = true;
 
 		if (!vmw_cmd_describe(header, &error_cmd_size, &cmd_name)) {