Texture array example reports Vulkan validation warnings

[aloucks]

Description

WGPU_POWER_PREF=high cargo run --example texture-arrays --features spirv
[2021-12-13T14:37:54Z ERROR wgpu_hal::vulkan::instance] VALIDATION [VUID-vkCmdDrawIndexed-None-02699 (0xa44449d4)]
        Validation Error: [ VUID-vkCmdDrawIndexed-None-02699 ] Object 0: handle = 0x908683000000001d, name = bind group, type = VK_OBJECT_TYPE_DESCRIPTOR_SET; | MessageID = 0xa44449d4 | Descriptor set VkDescriptorSet 0x908683000000001d[bind group] encountered the following validation error at vkCmdDrawIndexed time: Descriptor in binding #1 index 1 is being used in draw but has never been updated via vkUpdateDescriptorSets() or a similar call. The Vulkan spec states: Descriptors in each bound descriptor set, specified via vkCmdBindDescriptorSets, must be valid if they are statically used by the VkPipeline bound to the pipeline bind point used by this command (https://vulkan.lunarg.com/doc/view/1.2.198.1/windows/1.2-extensions/vkspec.html#VUID-vkCmdDrawIndexed-None-02699)
[2021-12-13T14:37:54Z ERROR wgpu_hal::vulkan::instance]         objects: (type: DESCRIPTOR_SET, hndl: 0x908683000000001d, name: bind group)
[2021-12-13T14:37:54Z ERROR wgpu_hal::vulkan::instance] VALIDATION [VUID-vkCmdDrawIndexed-None-02699 (0xa44449d4)]
        Validation Error: [ VUID-vkCmdDrawIndexed-None-02699 ] Object 0: handle = 0x908683000000001d, name = bind group, type = VK_OBJECT_TYPE_DESCRIPTOR_SET; | MessageID = 0xa44449d4 | Descriptor set VkDescriptorSet 0x908683000000001d[bind group] encountered the following validation error at vkCmdDrawIndexed time: Descriptor in binding #1 index 1 is being used in draw but has never been updated via vkUpdateDescriptorSets() or a similar call. The Vulkan spec states: Descriptors in each bound descriptor set, specified via vkCmdBindDescriptorSets, must be valid if they are statically used by the VkPipeline bound to the pipeline bind point used by this command (https://vulkan.lunarg.com/doc/view/1.2.198.1/windows/1.2-extensions/vkspec.html#VUID-vkCmdDrawIndexed-None-02699)
[2021-12-13T14:37:54Z ERROR wgpu_hal::vulkan::instance]         objects: (type: DESCRIPTOR_SET, hndl: 0x908683000000001d, name: bind group)
... repeated continuously while the app runs

Expected vs observed behavior
No validation errors

Platform
Windows 10