b43: Remove irqs_disabled() sanity checks

Remove all irqs_disabled() sanity checks, as they are not safe on
a RT-enabled kernel and will trigger bogus warnings.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43/debugfs.c b/drivers/net/wireless/b43/debugfs.c
index e38ed0f..7fca2ebc 100644
--- a/drivers/net/wireless/b43/debugfs.c
+++ b/drivers/net/wireless/b43/debugfs.c
@@ -618,6 +618,7 @@
 	kfree(e);
 }
 
+/* Called with IRQs disabled. */
 void b43_debugfs_log_txstat(struct b43_wldev *dev,
 			    const struct b43_txstatus *status)
 {
@@ -629,8 +630,7 @@
 	if (!e)
 		return;
 	log = &e->txstatlog;
-	B43_WARN_ON(!irqs_disabled());
-	spin_lock(&log->lock);
+	spin_lock(&log->lock); /* IRQs are already disabled. */
 	i = log->end + 1;
 	if (i == B43_NR_LOGGED_TXSTATUS)
 		i = 0;