pvr: Add missing NULL checks in some vkDestroy...() functions

Seems like `dEQP-VK.api.null_handle.destroy_device` was already
passing but let's add the null check in case of future changes
which might not accept NULL.

Fixes:
  dEQP-VK.api.null_handle.destroy_descriptor_set_layout
  dEQP-VK.api.null_handle.destroy_pipeline_layout
  dEQP-VK.api.null_handle.destroy_query_pool

Signed-off-by: Karmjit Mahil <Karmjit.Mahil@imgtec.com>
Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22918>

src/imagination/vulkan/pvr_descriptor_set.c

@@ -675,6 +675,9 @@ void pvr_DestroyDescriptorSetLayout(VkDevice _device,
    PVR_FROM_HANDLE(pvr_descriptor_set_layout, layout, _set_layout);
    PVR_FROM_HANDLE(pvr_device, device, _device);
 
+   if (!layout)
+      return;
+
    pvr_descriptor_set_layout_free(device, pAllocator, layout);
 }
 
@@ -1031,6 +1034,9 @@ void pvr_DestroyPipelineLayout(VkDevice _device,
    PVR_FROM_HANDLE(pvr_device, device, _device);
    PVR_FROM_HANDLE(pvr_pipeline_layout, layout, _pipelineLayout);
 
+   if (!layout)
+      return;
+
    vk_object_free(&device->vk, pAllocator, layout);
 }
 

src/imagination/vulkan/pvr_device.c

@@ -1960,6 +1960,9 @@ void pvr_DestroyDevice(VkDevice _device,
 {
    PVR_FROM_HANDLE(pvr_device, device, _device);
 
+   if (!device)
+      return;
+
    pvr_robustness_buffer_finish(device);
    pvr_spm_finish_scratch_buffer_store(device);
    pvr_queues_destroy(device);

src/imagination/vulkan/pvr_query.c

@@ -115,6 +115,9 @@ void pvr_DestroyQueryPool(VkDevice _device,
    PVR_FROM_HANDLE(pvr_query_pool, pool, queryPool);
    PVR_FROM_HANDLE(pvr_device, device, _device);
 
+   if (!pool)
+      return;
+
    pvr_bo_free(device, pool->availability_buffer);
    pvr_bo_free(device, pool->result_buffer);