SWDEV-330240 - HLK pnp with IO stress test fail

This code change is to improve error handling.
This code change does not fix issue itself.
Before this code change, hostcallBuffer_ point is initialized in the end of
create() function. If create function fails and returns early,
hostcallBuffer_ point is not initialized. This non-initialized point can
cause access violation when object is destructed.

This code change put the initialization of the pointer in the constructor.

Change-Id: I7fb6e764eb0547196dca03db237e49d3ff0fd06a

rocclr/device/pal/palvirtual.cpp

@@ -878,6 +878,9 @@ VirtualGPU::VirtualGPU(Device& device)
 
   queues_[MainEngine] = nullptr;
   queues_[SdmaEngine] = nullptr;
+
+  // The hostcall buffer for this vqueue is initialized on demand.
+  hostcallBuffer_ = nullptr;
 }
 
 bool VirtualGPU::create(bool profiling, uint deviceQueueSize, uint rtCUs,
@@ -1035,9 +1038,6 @@ bool VirtualGPU::create(bool profiling, uint deviceQueueSize, uint rtCUs,
                                               &dbg_vmid);
   }
 
-  // The hostcall buffer for this vqueue is initialized on demand.
-  hostcallBuffer_ = nullptr;
-
   return true;
 }