iwlegacy: s/index/idx/

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
diff --git a/drivers/net/wireless/iwlegacy/iwl-helpers.h b/drivers/net/wireless/iwlegacy/iwl-helpers.h
index a9d8702..5fcb23e 100644
--- a/drivers/net/wireless/iwlegacy/iwl-helpers.h
+++ b/drivers/net/wireless/iwlegacy/iwl-helpers.h
@@ -45,23 +45,23 @@
 }
 
 /**
- * il_queue_inc_wrap - increment queue index, wrap back to beginning
- * @index -- current index
+ * il_queue_inc_wrap - increment queue idx, wrap back to beginning
+ * @idx -- current idx
  * @n_bd -- total number of entries in queue (must be power of 2)
  */
-static inline int il_queue_inc_wrap(int index, int n_bd)
+static inline int il_queue_inc_wrap(int idx, int n_bd)
 {
-	return ++index & (n_bd - 1);
+	return ++idx & (n_bd - 1);
 }
 
 /**
- * il_queue_dec_wrap - decrement queue index, wrap back to end
- * @index -- current index
+ * il_queue_dec_wrap - decrement queue idx, wrap back to end
+ * @idx -- current idx
  * @n_bd -- total number of entries in queue (must be power of 2)
  */
-static inline int il_queue_dec_wrap(int index, int n_bd)
+static inline int il_queue_dec_wrap(int idx, int n_bd)
 {
-	return --index & (n_bd - 1);
+	return --idx & (n_bd - 1);
 }
 
 /* TODO: Move fw_desc functions to iwl-pci.ko */