anv: remove dead code from anv_create_cmd_buffer

pool can't be NULL at this point, because it was already
dereferenced earlier.

Addresses "Dereference before null check" issue reported by Coverity.

Signed-off-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7449>

src/intel/vulkan/anv_cmd_buffer.c

@@ -270,14 +270,7 @@ static VkResult anv_create_cmd_buffer(
 
    anv_cmd_state_init(cmd_buffer);
 
-   if (pool) {
-      list_addtail(&cmd_buffer->pool_link, &pool->cmd_buffers);
-   } else {
-      /* Init the pool_link so we can safefly call list_del when we destroy
-       * the command buffer
-       */
-      list_inithead(&cmd_buffer->pool_link);
-   }
+   list_addtail(&cmd_buffer->pool_link, &pool->cmd_buffers);
 
    *pCommandBuffer = anv_cmd_buffer_to_handle(cmd_buffer);