Warning fix. (#1565)

imgui.cpp

@@ -13069,7 +13069,7 @@ void ImGui::ShowMetricsWindow(bool* p_open)
         ImGui::Text("Dear ImGui %s", ImGui::GetVersion());
         ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
         ImGui::Text("%d vertices, %d indices (%d triangles)", ImGui::GetIO().MetricsRenderVertices, ImGui::GetIO().MetricsRenderIndices, ImGui::GetIO().MetricsRenderIndices / 3);
-        ImGui::Text("%d allocations", GImAllocatorActiveAllocationsCount);
+        ImGui::Text("%d allocations", (int)GImAllocatorActiveAllocationsCount);
         static bool show_clip_rects = true;
         ImGui::Checkbox("Show clipping rectangles when hovering draw commands", &show_clip_rects);
         ImGui::Separator();