Check the value of max_vfs at the time of assignment of vfs_allocated_count.

The previous check in igb_probe_vfs was too late as by that time the rx/tx
rings were initialized with the wrong offset.
Signed-off-by: NEmil Tantilov <emil.s.tantilov@intel.com>
Tested-by: NJeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>