net: rtl8139: Minor cleanup of set_rx_mode()

Rename the function to rtl8139_set_rx_mode(), use unsigned variables
where applicable and inline mc_filter[] values. No functional chanage.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>
1 file changed