rt2x00: Make rt2800_write_beacon only export to GPL

rt2800_write_beacon is the only function which uses
EXPORT_SYMBOL instead of EXPORT_SYMBOL_GPL. All symbols
in rt2x00 should however use the GPL restricted export.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index bcf50fc..afad3e1 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -473,7 +473,7 @@
 	dev_kfree_skb_any(entry->skb);
 	entry->skb = NULL;
 }
-EXPORT_SYMBOL(rt2800_write_beacon);
+EXPORT_SYMBOL_GPL(rt2800_write_beacon);
 
 static void inline rt2800_clear_beacon(struct rt2x00_dev *rt2x00dev,
 				       unsigned int beacon_base)