net: mac80211: Add and use ibss_vdbg debugging macro

Simplify the use of #ifdef CONFIG_MAC80211_IBSS_DEBUG/#endif
by adding a logging macro to encapsulate the test.

Convert the appropriate uses too.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 4be5098..0a70f79 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -887,10 +887,8 @@
 			continue;
 
 		if (time_after(jiffies, sta->last_rx + exp_time)) {
-#ifdef CONFIG_MAC80211_IBSS_DEBUG
-			pr_debug("%s: expiring inactive STA %pM\n",
-				 sdata->name, sta->sta.addr);
-#endif
+			ibss_vdbg("%s: expiring inactive STA %pM\n",
+				  sdata->name, sta->sta.addr);
 			WARN_ON(__sta_info_destroy(sta));
 		}
 	}