V4L/DVB (5840): fix dst and cx24123: tune() callback changed signess for delay

tune() dvb_frontend callback changed delay signess:
        int (*tune)(struct dvb_frontend* fe,
                    struct dvb_frontend_parameters* params,
                    unsigned int mode_flags,
-                   int *delay,
+                   unsigned int *delay,

This change caused warnings on cx24123 and dst modules:

/home/v4l/master/v4l/cx24123.c:1034: warning: initialization from incompatible pointer type
/home/v4l/master/v4l/dst.c:1782: warning: initialization from incompatible pointer type
/home/v4l/master/v4l/dst.c:1808: warning: initialization from incompatible pointer type
/home/v4l/master/v4l/dst.c:1837: warning: initialization from incompatible pointer type
/home/v4l/master/v4l/dst.c:1860: warning: initialization from incompatible pointer type

This patch corrects the function prototype on both modules to follow the
core change.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/dvb/bt8xx/dst.c b/drivers/media/dvb/bt8xx/dst.c
index e908e3c..b7a17e6 100644
--- a/drivers/media/dvb/bt8xx/dst.c
+++ b/drivers/media/dvb/bt8xx/dst.c
@@ -1652,7 +1652,7 @@
 static int dst_tune_frontend(struct dvb_frontend* fe,
 			    struct dvb_frontend_parameters* p,
 			    unsigned int mode_flags,
-			    int *delay,
+			    unsigned int *delay,
 			    fe_status_t *status)
 {
 	struct dst_state *state = fe->demodulator_priv;