net: fs_enet: use swap() in fs_enet_rx_napi()

Use kernel.h macro definition.

Thanks to Julia Lawall for Coccinelle scripting support.

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
Simple merge