staging: et131x: Remove unused rx_ring.recv_packet_pool

tx_ring.recv_packet_pool is unused, even in the original driver code.
Removed.
Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/et131x/et131x.c

@@ -337,8 +337,6 @@ struct rx_ring {
 
 	bool unfinished_receives;
 
-	struct list_head recv_packet_pool;
-
 	/* lookaside lists */
 	struct kmem_cache *recv_lookaside;
 };