i40e: Fix a memory leak in X722 rss config path

In any case free the memory allocated before exiting.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>