ice: Clean control queues only when they are initialized
Clean control queues only when they are initialized. One of the ways to validate if the basic initialization is done is by checking value of cq->sq.head and cq->rq.head variables that specify the register address. This patch adds a check to avoid NULL pointer dereference crash when tried to shutdown uninitialized control queue. Signed-off-by: NPreethi Banala <preethi.banala@intel.com> Signed-off-by: NAnirudh Venkataramanan <anirudh.venkataramanan@intel.com> Tested-by: NTony Brelinski <tonyx.brelinski@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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