Staging: serqt_usb2: add missing calls to tty_kref_put()

tty_port_tty_get() was called without a corresponding tty_kref_put()
in qt_read_bulk_callback() and qt_close().

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/serqt_usb2/serqt_usb2.c

@@ -360,18 +360,18 @@ static void qt_read_bulk_callback(struct urb *urb)
 	if (port_paranoia_check(port, __func__) != 0) {
 		dbg("%s - port_paranoia_check, exiting\n", __func__);
 		qt_port->ReadBulkStopped = 1;
-		return;
+		goto exit;
 	}
 
 	if (!serial) {
 		dbg("%s - bad serial pointer, exiting\n", __func__);
-		return;
+		goto exit;
 	}
 	if (qt_port->closePending == 1) {
 		/* Were closing , stop reading */
 		dbg("%s - (qt_port->closepending == 1\n", __func__);
 		qt_port->ReadBulkStopped = 1;
-		return;
+		goto exit;
 	}
 
 	/*
@@ -381,7 +381,7 @@ static void qt_read_bulk_callback(struct urb *urb)
 	 */
 	if (qt_port->RxHolding == 1) {
 		qt_port->ReadBulkStopped = 1;
-		return;
+		goto exit;
 	}
 
 	if (urb->status) {
@@ -389,7 +389,7 @@ static void qt_read_bulk_callback(struct urb *urb)
 
 		dbg("%s - nonzero read bulk status received: %d\n",
 		    __func__, urb->status);
-		return;
+		goto exit;
 	}
 
 	if (tty && RxCount) {
@@ -463,6 +463,8 @@ static void qt_read_bulk_callback(struct urb *urb)
 	}
 
 	schedule_work(&port->work);
+exit:
+	tty_kref_put(tty);
 }
 
 /*
@@ -1041,7 +1043,7 @@ static void qt_block_until_empty(struct tty_struct *tty,
 	}
 }
 
-static void qt_close( struct usb_serial_port *port)
+static void qt_close(struct usb_serial_port *port)
 {
 	struct usb_serial *serial = port->serial;
 	struct quatech_port *qt_port;
@@ -1068,6 +1070,7 @@ static void qt_close( struct usb_serial_port *port)
 	/* wait up to for transmitter to empty */
 	if (serial->dev)
 		qt_block_until_empty(tty, qt_port);
+	tty_kref_put(tty);
 
 	/* Close uart channel */
 	status = qt_close_channel(serial, index);