CVE-2022-49857 net: marvell: prestera: fix memory leak in prestera_rxtx_switch_init()

In the Linux kernel, the following vulnerability has been resolved: net: marvell: prestera: fix memory leak in presterarxtxswitchinit When presterasdmaswitchinit failed, the memory pointed to by sw-rxtx isn't released. Fix it. Only be compiled, not be tested...