ionic: Remove set but not used variable 'sg_desc'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/ethernet/pensando/ionic/ionic_txrx.c: In function 'ionic_rx_empty':
drivers/net/ethernet/pensando/ionic/ionic_txrx.c:405:28: warning:
variable 'sg_desc' set but not used [-Wunused-but-set-variable]

It is never used, so can be removed.

Signed-off-by: YueHaibing <[e-mail]>
Acked-by: Shannon Nelson <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/pensando/ionic/ionic_txrx.c

···
 
 void ionic_rx_empty(struct ionic_queue *q)
 {
-	struct ionic_rxq_sg_desc *sg_desc;
 	struct ionic_desc_info *cur;
 	struct ionic_rxq_desc *desc;
 	unsigned int i;
···
 		desc->addr = 0;
 		desc->len = 0;
 
-		sg_desc = cur->sg_desc;
 		for (i = 0; i < cur->npages; i++) {
 			if (likely(cur->pages[i].page)) {
 				ionic_rx_page_free(q, cur->pages[i].page,