UBIFS: fix tnc dumping

debugfs tnc dumping was broken because of an obvious typo.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index 934db18..367d975 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -2443,7 +2443,7 @@
 		spin_lock(&c->space_lock);
 		dbg_dump_budg(c);
 		spin_unlock(&c->space_lock);
-	} else if (file->f_path.dentry == d->dump_budg) {
+	} else if (file->f_path.dentry == d->dump_tnc) {
 		mutex_lock(&c->tnc_mutex);
 		dbg_dump_tnc(c);
 		mutex_unlock(&c->tnc_mutex);