[PATCH] S2io: Removed memory leaks

Hi,
This patch fixes certain memory leaks discovered in free_tx_buffers()
and rx_osm_handler()

Signed-off-by: Ravinandan Arakali <ravinandan.arakali@neterion.com>
Signed-off-by: Raghavendra Koushik <raghavendra.koushik@neterion.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>