wsl/hsakmt: Fix conversion warnings by using 0 for Non-Pointers

This patch addresses several compiler warnings related to the use of
NULL with non-pointer types, such as D3DKMT_HANDLE, uint64_t, and uint32_t.

Signed-off-by: Horatio Zhang <Hongkun.Zhang@amd.com>
Reviewed-by: tiancyin <tianci.yin@amd.com>
Part-of: <http://10.67.69.192/wsl/rocr-runtime/-/merge_requests/16>

wddm/queue.cpp

@@ -528,7 +528,7 @@ uint64_t ComputeQueue::GetKernelObjAddr(uint64_t addr) const {
   auto ret = hsakmt_hsa_ven_amd_loader_query_host_address(reinterpret_cast<const void *>(addr),
                                            reinterpret_cast<const void **>(&host_addr));
   if (ret == HSA_STATUS_ERROR_INVALID_ARGUMENT) {
-    return NULL;
+    return 0;
   }
 
   return host_addr;