[MAC80211]: add "invalid" interface type

Since I cannot convince the lazy driver authors (hello Michael)
to stop (ab)using the MGMT interface type internally in their
drivers, this patch introduces a new _INVALID type especially
for their use and changes all affected drivers to use it.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index 511c11c..6262d4e 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -297,7 +297,7 @@
 	 * When set to INVALID_INTERFACE, no interface is configured.
 	 */
 	int type;
-#define INVALID_INTERFACE	IEEE80211_IF_TYPE_MGMT
+#define INVALID_INTERFACE	IEEE80211_IF_TYPE_INVALID
 
 	/*
 	 * MAC of the device.