anv: assert inheritance_info is not NULL

Makes some static analysis tools happier.

Reviewed-by: Mark Janes <markjanes@swizzler.org>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17809>

src/intel/vulkan/genX_cmd_buffer.c

@@ -1694,6 +1694,7 @@ genX(BeginCommandBuffer)(
          const VkCommandBufferInheritanceRenderingInfo *inheritance_info =
             vk_get_command_buffer_inheritance_rendering_info(cmd_buffer->vk.level,
                                                              pBeginInfo);
+         assert(inheritance_info);
 
          gfx->rendering_flags = inheritance_info->flags;
          gfx->render_area = (VkRect2D) { };