net/virtio: remove useless pointer checks

This patch removes useless checks on 'prev' pointer, as it
is always set before with a valid value.

Reviewed-by: David Marchand <[email protected]>
Reviewed-by: Tiwei Bie <[email protected]>
Signed-off-by: Maxime Coquelin <[email protected]>

Author: mcoquelin

drivers/net/virtio/virtio_rxtx.c

@@ -1512,9 +1512,7 @@ virtio_recv_pkts_inorder(void *rx_queue,
 
 			rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
 
-			if (prev)
-				prev->next = rxm;
-
+			prev->next = rxm;
 			prev = rxm;
 			seg_res -= 1;
 		}
@@ -1696,9 +1694,7 @@ virtio_recv_mergeable_pkts(void *rx_queue,
 
 			rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
 
-			if (prev)
-				prev->next = rxm;
-
+			prev->next = rxm;
 			prev = rxm;
 			seg_res -= 1;
 		}
@@ -1871,9 +1867,7 @@ virtio_recv_mergeable_pkts_packed(void *rx_queue,
 
 			rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
 
-			if (prev)
-				prev->next = rxm;
-
+			prev->next = rxm;
 			prev = rxm;
 			seg_res -= 1;
 		}
@@ -1916,8 +1910,7 @@ virtio_recv_mergeable_pkts_packed(void *rx_queue,
 		} else {
 			PMD_RX_LOG(ERR,
 					"No enough segments for packet.");
-			if (prev)
-				virtio_discard_rxbuf(vq, prev);
+			virtio_discard_rxbuf(vq, prev);
 			rxvq->stats.errors++;
 			break;
 		}