wl1271: fix notifier interface supported test

The "(wl == NULL)" test doesn't work here because "wl" is always
non-null.  The intent of the code is to return if the interface
was not supported by the driver.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1271_main.c

@@ -852,7 +852,7 @@ static int wl1271_dev_notify(struct notifier_block *me, unsigned long what,
 		if (wl == wl_temp)
 			break;
 	}
-	if (wl == NULL)
+	if (wl != wl_temp)
 		return NOTIFY_DONE;
 
 	/* Get the interface IP address for the device. "ifa" will become