[Bluetooth] Avoid NULL pointer dereference with tty->driver
This patch checks for tty->driver before trying to call flush_buffer().
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
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This patch checks for tty->driver before trying to call flush_buffer().
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>