iwlwifi: make iwl_queue_used return bool

Also, prefer the if(!X) notation over if(X == 0).
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/iwlwifi/pcie/internal.h

@@ -423,7 +423,7 @@ static inline void iwl_stop_queue(struct iwl_trans *trans,
 				    txq->q.id);
 }
 
-static inline int iwl_queue_used(const struct iwl_queue *q, int i)
+static inline bool iwl_queue_used(const struct iwl_queue *q, int i)
 {
 	return q->write_ptr >= q->read_ptr ?
 		(i >= q->read_ptr && i < q->write_ptr) :

drivers/net/wireless/iwlwifi/pcie/tx.c

@@ -918,7 +918,7 @@ void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn,
 	 * the last we will free. This one must be used */
 	last_to_free = iwl_queue_dec_wrap(tfd_num, q->n_bd);
 
-	if (iwl_queue_used(q, last_to_free) == 0) {
+	if (!iwl_queue_used(q, last_to_free)) {
 		IWL_ERR(trans,
 			"%s: Read index for DMA queue txq id (%d), last_to_free %d is out of range [0-%d] %d %d.\n",
 			__func__, txq_id, last_to_free, q->n_bd,
@@ -969,7 +969,7 @@ static void iwl_pcie_cmdq_reclaim(struct iwl_trans *trans, int txq_id, int idx)
 
 	lockdep_assert_held(&txq->lock);
 
-	if ((idx >= q->n_bd) || (iwl_queue_used(q, idx) == 0)) {
+	if ((idx >= q->n_bd) || (!iwl_queue_used(q, idx))) {
 		IWL_ERR(trans,
 			"%s: Read index for DMA queue txq id (%d), index %d is out of range [0-%d] %d %d.\n",
 			__func__, txq_id, idx, q->n_bd,