iwlwifi: mvm: cleanup skb queue functions use
Use skb_queue_empty() and not skb_peek_tail() to check for empty list. Avoid a redundant check as well - loop will take care of it. Signed-off-by: NSara Sharon <sara.sharon@intel.com> Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>
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