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/cmd_util.cpp

@@ -256,8 +256,8 @@ size_t CmdUtil::BuildDispatch(
     // This feature may be enabled as a side effect of indirect calls.
     // However, the compiler team confirmed that the dispatch id itself is not used,
     // so safe to send 0 for each dispatch.
-    dispatch.compute_user_data_regs.compute_user_data[sgpr_no++] = NULL;
-    dispatch.compute_user_data_regs.compute_user_data[sgpr_no++] = NULL;
+    dispatch.compute_user_data_regs.compute_user_data[sgpr_no++] = 0;
+    dispatch.compute_user_data_regs.compute_user_data[sgpr_no++] = 0;
   }
   if (AMD_HSA_BITS_GET(pInfo->pKernelObject->kernel_code_properties,
 		       AMD_KERNEL_CODE_PROPERTIES_ENABLE_SGPR_FLAT_SCRATCH_INIT)) {