net: wimax: i2400m: fix 'msg_skb' kernel-doc warning in i2400m_msg_to_dev()

Fixes the following W=1 kernel build warning(s):

drivers/net/wimax/i2400m/control.c:709: warning: Excess function parameter 'msg_skb' description in 'i2400m_msg_to_dev'

This parameter is not in use. Remove it.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>