app/testpmd: fix interactive mode with no ports

[ upstream commit 7e40372522c5a129da616d1420ff582968b81b46 ]

Testpmd terminated unconditionally if it failed to start all ports.

The patch allows testpmd to get into the command line,
if the interactive mode was requested.

Fixes: 6937d21 ("app/testpmd: add option to not start device")

Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Acked-by: Ferruh Yigit <ferruh.yigit@amd.com>

app/test-pmd/testpmd.c

@@ -4376,8 +4376,13 @@ main(int argc, char** argv)
 		}
 	}
 
-	if (!no_device_start && start_port(RTE_PORT_ALL) != 0)
-		rte_exit(EXIT_FAILURE, "Start ports failed\n");
+	if (!no_device_start && start_port(RTE_PORT_ALL) != 0) {
+		if (!interactive) {
+			rte_eal_cleanup();
+			rte_exit(EXIT_FAILURE, "Start ports failed\n");
+		}
+		fprintf(stderr, "Start ports failed\n");
+	}
 
 	/* set all ports to promiscuous mode by default */
 	RTE_ETH_FOREACH_DEV(port_id) {