raw/dpaa2_cmdif: fix warnings with GCC 9

GCC9 gives warnings if the parameter passed to printf for "%s" could be
NULL, so we need to add checks in some cases to ensure that is not the
case.

Fixes: 3298fa4853 ("raw/dpaa2_cmdif: introduce DPAA2 command interface driver")
Cc: stable@dpdk.org

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>

drivers/raw/dpaa2_cmdif/dpaa2_cmdif.c

@@ -270,6 +270,8 @@ dpaa2_cmdif_remove(struct rte_vdev_device *vdev)
 	int ret;
 
 	name = rte_vdev_device_name(vdev);
+	if (name == NULL)
+		return -1;
 
 	DPAA2_CMDIF_INFO("Closing %s on NUMA node %d", name, rte_socket_id());