If LSC flag is changed to off at last device start, the
enable flag is not cleared in HW.
This patch fixes it.
Fixes: c3cd3de0ab ("igb: enable Rx queue interrupts for PF")
Cc: stable@dpdk.org
Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
Acked-by: Wenzhuo Lu <wenzhuo.lu@intel.com>