drm/vmwgfx/vmwgfx_cmdbuf_res: Remove unused variable 'ret'

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf_res.c: In function ‘vmw_cmdbuf_res_revert’:
 drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf_res.c:162:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]

Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Roland Scheidegger <sroland@vmware.com>
Cc: Zack Rusin <zackr@vmware.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210115181313.3431493-40-lee.jones@linaro.org

drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf_res.c

@@ -159,7 +159,6 @@ void vmw_cmdbuf_res_commit(struct list_head *list)
 void vmw_cmdbuf_res_revert(struct list_head *list)
 {
 	struct vmw_cmdbuf_res *entry, *next;
-	int ret;
 
 	list_for_each_entry_safe(entry, next, list, head) {
 		switch (entry->state) {
@@ -167,8 +166,7 @@ void vmw_cmdbuf_res_revert(struct list_head *list)
 			vmw_cmdbuf_res_free(entry->man, entry);
 			break;
 		case VMW_CMDBUF_RES_DEL:
-			ret = drm_ht_insert_item(&entry->man->resources,
-						 &entry->hash);
+			drm_ht_insert_item(&entry->man->resources, &entry->hash);
 			list_del(&entry->head);
 			list_add_tail(&entry->head, &entry->man->list);
 			entry->state = VMW_CMDBUF_RES_COMMITTED;