mac80211: clean up mesh RX path a bit more

Moves another ifdef into the sta_info header file in favour of
compiling more code even w/o CONFIG_MAC80211_MESH.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: Luis Carlos Cobo <luisca@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index 4ad5003..4d0840b 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -235,6 +235,14 @@
 #endif
 };
 
+static inline enum plink_state sta_plink_state(struct sta_info *sta)
+{
+#ifdef CONFIG_MAC80211_MESH
+	return sta->plink_state;
+#endif
+	return LISTEN;
+}
+
 
 /* Maximum number of concurrently registered stations */
 #define MAX_STA_COUNT 2007