rt2x00: Only remove L2 padding in received frames if there is payload.

L2 padding will only be present when there is actual payload present.

Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Ivo van Doorn <ivdoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --cc drivers/net/wireless/rt2x00/rt2x00dev.c
Simple merge