Fix memory leak in particle buffers recycling

#3152

Source/Engine/Particles/Particles.cpp

@@ -1053,7 +1053,6 @@ void UpdateGPU(RenderTask* task, GPUContext* context)
     ScopeLock lock(GpuUpdateListLocker);
     if (GpuUpdateList.IsEmpty())
         return;
-
     PROFILE_GPU("GPU Particles");
 
     for (ParticleEffect* effect : GpuUpdateList)
@@ -1093,6 +1092,7 @@ void UpdateGPU(RenderTask* task, GPUContext* context)
 
 ParticleBuffer* Particles::AcquireParticleBuffer(ParticleEmitter* emitter)
 {
+    PROFILE_CPU();
     ParticleBuffer* result = nullptr;
     ASSERT(emitter && emitter->IsLoaded());
 
@@ -1102,7 +1102,7 @@ ParticleBuffer* Particles::AcquireParticleBuffer(ParticleEmitter* emitter)
         const auto entries = Pool.TryGet(emitter);
         if (entries)
         {
-            while (entries->HasItems())
+            while (entries->HasItems() && !result)
             {
                 // Reuse buffer
                 result = entries->Last().Buffer;
@@ -1113,11 +1113,6 @@ ParticleBuffer* Particles::AcquireParticleBuffer(ParticleEmitter* emitter)
                 {
                     Delete(result);
                     result = nullptr;
-                    if (entries->IsEmpty())
-                    {
-                        Pool.Remove(emitter);
-                        break;
-                    }
                 }
             }
         }
@@ -1146,6 +1141,7 @@ ParticleBuffer* Particles::AcquireParticleBuffer(ParticleEmitter* emitter)
 
 void Particles::RecycleParticleBuffer(ParticleBuffer* buffer)
 {
+    PROFILE_CPU();
     if (buffer->Emitter->EnablePooling && EnableParticleBufferPooling)
     {
         // Return to pool
@@ -1166,6 +1162,7 @@ void Particles::RecycleParticleBuffer(ParticleBuffer* buffer)
 
 void Particles::OnEmitterUnload(ParticleEmitter* emitter)
 {
+    PROFILE_CPU();
     PoolLocker.Lock();
     const auto entries = Pool.TryGet(emitter);
     if (entries)