mlx4_en: remove unnecessary returned value
The function mlx4_en_arm_cq always returns zero. So change the return type of the function mlx4_en_arm_cq to void. CC: Joe Jin <joe.jin@oracle.com> CC: Junxiao Bi <junxiao.bi@oracle.com> Signed-off-by: Zhu Yanjun <yanjun.zhu@oracle.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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