Fix some leaks creating root signature blobs

Author: baldurk

renderdoc/driver/d3d12/d3d12_postvs.cpp

@@ -2206,11 +2206,13 @@ void D3D12Replay::InitPostMSBuffers(uint32_t eventId)
   ID3D12RootSignature *annotatedSig = NULL;
 
   {
-    ID3DBlob *root = m_pDevice->GetShaderCache()->MakeRootSig(modsig);
+    ID3DBlob *blob = m_pDevice->GetShaderCache()->MakeRootSig(modsig);
     HRESULT hr =
-        m_pDevice->CreateRootSignature(0, root->GetBufferPointer(), root->GetBufferSize(),
+        m_pDevice->CreateRootSignature(0, blob->GetBufferPointer(), blob->GetBufferSize(),
                                        __uuidof(ID3D12RootSignature), (void **)&annotatedSig);
 
+    SAFE_RELEASE(blob);
+
     if(annotatedSig == NULL || FAILED(hr))
     {
       ret.ampout.status = ret.meshout.status = StringFormat::Fmt(

renderdoc/driver/d3d12/d3d12_shader_feedback.cpp

@@ -1336,9 +1336,12 @@ bool D3D12Replay::FetchShaderFeedback(uint32_t eventId)
 
     if(annotatedSig == NULL || FAILED(hr))
     {
+      SAFE_RELEASE(root);
       RDCERR("Couldn't create feedback modified root signature: %s", ToStr(hr).c_str());
       return false;
     }
+
+    SAFE_RELEASE(root);
   }
 
   ID3D12PipelineState *annotatedPipe = NULL;