vk: track depth-stencil "renderbuffer" usage correctly

src/rhi/qrhivulkan.cpp

@@ -1833,6 +1833,8 @@ void QRhiVulkan::activateTextureRenderTarget(QRhiCommandBuffer *, QRhiTextureRen
             rbD->lastActiveFrameSlot = currentFrameSlot;
         }
     }
+    if (rtD->m_desc.depthStencilBuffer())
+        QRHI_RES(QVkRenderBuffer, rtD->m_desc.depthStencilBuffer())->lastActiveFrameSlot = currentFrameSlot;
     if (rtD->m_desc.depthTexture()) {
         QVkTexture *depthTexD = QRHI_RES(QVkTexture, rtD->m_desc.depthTexture());
         depthTexD->layout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;
@@ -3718,7 +3720,6 @@ void QVkBuffer::release()
         pendingDynamicUpdates[i].clear();
     }
 
-    // the rhi is still around, good
     QRHI_RES_RHI(QRhiVulkan);
     rhiD->releaseQueue.append(e);
 
@@ -3926,7 +3927,6 @@ void QVkTexture::release()
     imageAlloc = nullptr;
     nativeHandlesStruct.image = VK_NULL_HANDLE;
 
-    // the rhi is still around, good
     QRHI_RES_RHI(QRhiVulkan);
     rhiD->releaseQueue.append(e);