staging: et131x: using is_zero_ether_addr() to simplify the code

Using is_zero_ether_addr() to simplify the code

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 file changed