staging: gdm724x: gdm_tty: fix tty api build warnings

This fixes the build warnings due to changes in the tty api.  Note, I
don't know if the reference counting is correct, but at least there are
no more build warnings.

Also the tty code needs to be reworked, no static arrays of tty devices
and the like...

Cc: Won Kang <wonkang@gctsemi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gdm724x/gdm_tty.c

@@ -131,7 +131,7 @@ static void gdm_tty_close(struct tty_struct *tty, struct file *filp)
 static int gdm_tty_recv_complete(void *data, int len, int index, int minor, int complete)
 {
 	struct tty_str *tty_str = g_tty_str[index][minor];
-	struct tty_struct *tty;
+	struct tty_port *tty_port;
 
 	if (!GDM_TTY_READY(tty_str)) {
 		if (complete == RECV_PACKET_PROCESS_COMPLETE)
@@ -142,17 +142,15 @@ static int gdm_tty_recv_complete(void *data, int len, int index, int minor, int
 	if (!data || !len)
 		goto complete_routine;
 
-	tty = tty_port_tty_get(&tty_str->port);
+	tty_port = &tty_str->port;
 
-	if (tty_buffer_request_room(tty, len) == len) {
-		tty_insert_flip_string(tty, data, len);
-		tty_flip_buffer_push(tty);
+	if (tty_buffer_request_room(tty_port, len) == len) {
+		tty_insert_flip_string(tty_port, data, len);
+		tty_flip_buffer_push(tty_port);
 	} else {
-		tty_kref_put(tty);
 		return TO_HOST_BUFFER_REQUEST_FAIL;
 	}
 
-	tty_kref_put(tty);
 complete_routine:
 	if (complete == RECV_PACKET_PROCESS_COMPLETE)
 		gdm_tty_recv(tty_str, gdm_tty_recv_complete);