Simplify pointer info version check.

Change-Id: I0ed363f1261ffc041547f313970ca67298ace56c

runtime/hsa-runtime/core/runtime/runtime.cpp

@@ -687,8 +687,8 @@ hsa_status_t Runtime::PtrInfo(void* ptr, hsa_amd_pointer_info_t* info, void* (*a
 
   hsa_amd_pointer_info_t retInfo;
 
-  // check output struct is at least as large as the first info revision.
-  if (info->size < 40) return HSA_STATUS_ERROR_INVALID_ARGUMENT;
+  // check output struct has an initialized size.
+  if (info->size == 0) return HSA_STATUS_ERROR_INVALID_ARGUMENT;
 
   bool returnListData =
       ((alloc != nullptr) && (num_agents_accessible != nullptr) && (accessible != nullptr));