mac80211: minor code cleanups

Nothing very interesting, some checkpatch inspired stuff,
some other things.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/rc80211_pid.h b/net/mac80211/rc80211_pid.h
index 01d64d5..ce099ea 100644
--- a/net/mac80211/rc80211_pid.h
+++ b/net/mac80211/rc80211_pid.h
@@ -49,7 +49,7 @@
 
 /* Arithmetic right shift for positive and negative values for ISO C. */
 #define RC_PID_DO_ARITH_RIGHT_SHIFT(x, y) \
-	(x) < 0 ? -((-(x)) >> (y)) : (x) >> (y)
+	((x) < 0 ? -((-(x)) >> (y)) : (x) >> (y))
 
 enum rc_pid_event_type {
 	RC_PID_EVENT_TYPE_TX_STATUS,