sfc: Minor formatting cleanup

Fix some indentation and line continuations.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

diff --cc drivers/net/ethernet/sfc/bitfield.h
Simple merge

diff --cc drivers/net/ethernet/sfc/mcdi_mon.c
Simple merge

diff --cc drivers/net/ethernet/sfc/tx.c
Simple merge