net: rtl8139: Minor cleanup of rtl_transmit()

Rename the function to rtl8139_send(), clean up the TX polling, the TX
OK condition at the end, overuse of typecasts, and various line-over-80
problems. No functional change.

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