cfg80211: mark ops as pointer to const

This allows drivers to mark their cfg80211_ops tables const.

Signed-off-by: David Kilroy <kilroyd@googlemail.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 88f234c..9511c2b 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -16,7 +16,7 @@
 #include "reg.h"
 
 struct cfg80211_registered_device {
-	struct cfg80211_ops *ops;
+	const struct cfg80211_ops *ops;
 	struct list_head list;
 	/* we hold this mutex during any call so that
 	 * we cannot do multiple calls at once, and also