iwlwifi: fix aggregation limit

According to the documentation, the limit is 0x3f == 63, not 64.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-commands.h b/drivers/net/wireless/iwlwifi/iwl-commands.h
index 6e9b8a8..ebb2fbc 100644
--- a/drivers/net/wireless/iwlwifi/iwl-commands.h
+++ b/drivers/net/wireless/iwlwifi/iwl-commands.h
@@ -1924,7 +1924,7 @@
 #define LINK_QUAL_AGG_DISABLE_START_MIN	(0)
 
 #define LINK_QUAL_AGG_FRAME_LIMIT_DEF	(31)
-#define LINK_QUAL_AGG_FRAME_LIMIT_MAX	(64)
+#define LINK_QUAL_AGG_FRAME_LIMIT_MAX	(63)
 #define LINK_QUAL_AGG_FRAME_LIMIT_MIN	(0)
 
 /**