staging: fsl-dpaa2/ethsw: Remove useless set memory to zero use memset()

The memory return by kzalloc() has already be set to zero, so remove
useless memset(0).

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Link: https://lore.kernel.org/r/20190802013149.80952-1-weiyongjun1@huawei.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>