Fix Cppcheck warning about memset on NULL backend_ids (#3970)
Fix Cppcheck warning about memset on NULL backend_ids (#3970)

Signed-off-by: Charles Volzka <622487ccafb558476c629452ffdaa3723d2cb5c6@us.ibm.com>
onnx/onnx,onnx/onnx,onnx/onnx,onnx/onnx