ring: fix memory leak when detaching
ring: fix memory leak when detaching

When freeing the device it is also neccesary to free
rx_queues and tx_queues

Signed-off-by: Mauricio Vasquez B <3c3d05761bb6e7ed574fac8375065a4e1e1e099e@studenti.polito.it>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk