V4L/DVB: V4L: dvb-usb, add extra sync to down-up input events

Userspace is allowed to coalesce events between SYNCs. And since the code
emits UP right after DOWN for the same key, it may be missed
(up+down=nothing). Add an extra sync in between UP and DOWN events to disable
the coalesce.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Patrick Boettcher <pboettcher@kernellabs.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-usb/dib0700_core.c

@@ -612,6 +612,7 @@ static void dib0700_rc_urb_completion(struct urb *purb)
 	case REMOTE_KEY_REPEAT:
 		deb_info("key repeated\n");
 		input_event(d->rc_input_dev, EV_KEY, event, 1);
+		input_sync(d->rc_input_dev);
 		input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
 		input_sync(d->rc_input_dev);
 		break;

drivers/media/dvb/dvb-usb/dvb-usb-remote.c

@@ -107,6 +107,7 @@ static void dvb_usb_read_remote_control(struct work_struct *work)
 		case REMOTE_KEY_REPEAT:
 			deb_rc("key repeated\n");
 			input_event(d->rc_input_dev, EV_KEY, event, 1);
+			input_sync(d->rc_input_dev);
 			input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
 			input_sync(d->rc_input_dev);
 			break;