vt_ioctl: fix lock imbalance

Don't return from switch/case directly in vt_ioctl. Set ret and break
instead so that we unlock BKL.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/char/vt_ioctl.c b/drivers/char/vt_ioctl.c
index e6ce632..7539bed 100644
--- a/drivers/char/vt_ioctl.c
+++ b/drivers/char/vt_ioctl.c
@@ -396,7 +396,8 @@
 	kbd = kbd_table + console;
 	switch (cmd) {
 	case TIOCLINUX:
-		return tioclinux(tty, arg);
+		ret = tioclinux(tty, arg);
+		break;
 	case KIOCSOUND:
 		if (!perm)
 			goto eperm;