From: d4r Windows port
Subject: [PATCH] Backport AMD external-memory view ownership fix to ROCm 7.2

Upstream fix: ROCm/clr 529f6b1641de436dafbb095d5438b0fbf773765d
(ROCm/rocm-systems #3528). Already present in current upstream.
The constructor owns reference 1. MemObjMap does not retain the view;
hipFree removes the entry and releases reference 1. The extra retain
leaks the view and its parent imported allocation.

Hardware regression: d4r_d3d12_hip_interop_probe --interop-mode map
--iterations 64. Windows SDK 7.2.60201 leaks one HANDLE / 256 KiB each
cycle; tested TheRock 10.2.0a20260929 (HIP 7.17.26386) stays bounded.
This patch is for rebuilding old runtime sources, never binary patching.

diff --git a/hipamd/src/hip_memory.cpp b/hipamd/src/hip_memory.cpp
--- a/hipamd/src/hip_memory.cpp
+++ b/hipamd/src/hip_memory.cpp
@@ -179,7 +179,6 @@ hipError_t hipExternalMemoryGetMappedBuffer(void** devPtr, hipExternalMemory_t extMem,
   // Map the device memory to the user pointer
   *devPtr = reinterpret_cast<void*>(devMem->virtualAddress());
   amd::MemObjMap::AddMemObj(*devPtr, view);
-  view->retain();
 
   HIP_RETURN(hipSuccess);
 }