mac80211: return bool instead of numbers in yes/no function

And some code style changes in the function, and correct a typo in
comment.
Signed-off-by: Zhao, Gang <gamerh2o@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/rx.c

@@ -54,24 +54,25 @@ static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
 	return skb;
 }
 
-static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len)
+static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len)
 {
 	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
-	struct ieee80211_hdr *hdr;
-
-	hdr = (void *)(skb->data);
+	struct ieee80211_hdr *hdr = (void *)skb->data;
 
 	if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
 			    RX_FLAG_FAILED_PLCP_CRC |
 			    RX_FLAG_AMPDU_IS_ZEROLEN))
-		return 1;
+		return true;
+
 	if (unlikely(skb->len < 16 + present_fcs_len))
-		return 1;
+		return true;
+
 	if (ieee80211_is_ctl(hdr->frame_control) &&
 	    !ieee80211_is_pspoll(hdr->frame_control) &&
 	    !ieee80211_is_back_req(hdr->frame_control))
-		return 1;
-	return 0;
+		return true;
+
+	return false;
 }
 
 static int
@@ -3190,7 +3191,7 @@ static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
 }
 
 /*
- * This is the actual Rx frames handler. as it blongs to Rx path it must
+ * This is the actual Rx frames handler. as it belongs to Rx path it must
  * be called with rcu_read_lock protection.
  */
 static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,