ImGui: Clear memory for font after creating texture

src/frontend-common/imgui_impl_dx11.cpp

@@ -314,6 +314,8 @@ static void ImGui_ImplDX11_CreateFontsTexture()
         desc.MaxLOD = 0.f;
         g_pd3dDevice->CreateSamplerState(&desc, &g_pFontSampler);
     }
+
+    io.Fonts->ClearTexData();
 }
 
 bool    ImGui_ImplDX11_CreateDeviceObjects()