ixgbe: Change where clear_to_send_flag is reset to zero.

The clear_to_send flag is being cleared before the call to ping all
the VFs.  It should be called after pinging all the VFs.

Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>