[HIP][CMD-BUF] HIP coverity fixes

* Don't throw from constructor
* Move rather than copy nodes during sync-point registration
* Initalize `NextSyncPoint`

Author: Ewan Crawford

source/adapters/hip/command_buffer.cpp

@@ -50,7 +50,7 @@ ur_exp_command_buffer_handle_t_::ur_exp_command_buffer_handle_t_(
     ur_context_handle_t hContext, ur_device_handle_t hDevice, bool IsUpdatable)
     : Context(hContext), Device(hDevice),
       IsUpdatable(IsUpdatable), HIPGraph{nullptr}, HIPGraphExec{nullptr},
-      RefCountInternal{1}, RefCountExternal{1} {
+      RefCountInternal{1}, RefCountExternal{1}, NextSyncPoint{0} {
   urContextRetain(hContext);
   urDeviceRetain(hDevice);
 }
@@ -65,11 +65,11 @@ ur_exp_command_buffer_handle_t_::~ur_exp_command_buffer_handle_t_() {
   UR_TRACE(urDeviceRelease(Device));
 
   // Release the memory allocated to the HIPGraph
-  UR_CHECK_ERROR(hipGraphDestroy(HIPGraph));
+  (void)hipGraphDestroy(HIPGraph);
 
   // Release the memory allocated to the HIPGraphExec
   if (HIPGraphExec) {
-    UR_CHECK_ERROR(hipGraphExecDestroy(HIPGraphExec));
+    (void)hipGraphExecDestroy(HIPGraphExec);
   }
 }
 

source/adapters/hip/command_buffer.hpp

@@ -254,8 +254,8 @@ struct ur_exp_command_buffer_handle_t_ {
   ~ur_exp_command_buffer_handle_t_();
 
   void registerSyncPoint(ur_exp_command_buffer_sync_point_t SyncPoint,
-                         std::shared_ptr<hipGraphNode_t> HIPNode) {
-    SyncPoints[SyncPoint] = HIPNode;
+                         std::shared_ptr<hipGraphNode_t> &&HIPNode) {
+    SyncPoints[SyncPoint] = std::move(HIPNode);
     NextSyncPoint++;
   }
 
@@ -269,7 +269,7 @@ struct ur_exp_command_buffer_handle_t_ {
   ur_exp_command_buffer_sync_point_t
   addSyncPoint(std::shared_ptr<hipGraphNode_t> HIPNode) {
     ur_exp_command_buffer_sync_point_t SyncPoint = NextSyncPoint;
-    registerSyncPoint(SyncPoint, HIPNode);
+    registerSyncPoint(SyncPoint, std::move(HIPNode));
     return SyncPoint;
   }
   uint32_t incrementInternalReferenceCount() noexcept {