igb: Fix a deadlock in igb_sriov_reinit
When igb_init_interrupt_scheme in igb_sriov_reinit is failed, the lock acquired by rtnl_lock() is not released, which causes a deadlock. This patch adds rtnl_unlock() in error handling to fix it. Signed-off-by: NJia-Ju Bai <baijiaju1990@163.com> Tested-by: NAaron Brown <aaron.f.brown@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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