net/ring: fix return value check

[ upstream commit e0474b9 ]

'rte_eth_dev_get_port_by_name()' return value is not checked caught by
coverity, adding return value check.

Coverity issue: 305853
Fixes: 96cb195 ("net/ring: use EAL APIs in PMD specific API")

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

drivers/net/ring/rte_eth_ring.c

@@ -396,7 +396,11 @@ rte_eth_from_rings(const char *name, struct rte_ring *const rx_queues[],
 		return -1;
 	}
 
-	rte_eth_dev_get_port_by_name(ring_name, &port_id);
+	ret = rte_eth_dev_get_port_by_name(ring_name, &port_id);
+	if (ret) {
+		rte_errno = ENODEV;
+		return -1;
+	}
 
 	return port_id;
 }