[Bluetooth]: Call tty_hangup() when DCD is de-asserted

The RFCOMM layer does not handle properly the de-assertation
of CD signal. It should call tty_hangup() to work properly.

Signed-off-by: Timo Teräs <[email protected]>
Signed-off-by: Marcel Holtmann <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
1 file changed