[media] saa7164-dvb: Remove unnecessary null test

This patch removes the null test on dvb. dvb is initialized at the
beginning of the function to &port->dvb. Since port is dereferenced
prior to the null test, port must be a valid pointer, and
&port->dvb cannot be null.

The following Coccinelle script is used for detecting the change:

@r@
expression e,f;
identifier g,y;
statement S1,S2;
@@

*e = &f->g
<+...
 f->y
 ...+>
*if (e != NULL || ...)
 S1 else S2
Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/pci/saa7164/saa7164-dvb.c

@@ -242,7 +242,6 @@ static int saa7164_dvb_start_feed(struct dvb_demux_feed *feed)
 	if (!demux->dmx.frontend)
 		return -EINVAL;
 
-	if (dvb) {
 	mutex_lock(&dvb->lock);
 	if (dvb->feeding++ == 0) {
 		/* Start transport */
@@ -251,7 +250,6 @@ static int saa7164_dvb_start_feed(struct dvb_demux_feed *feed)
 	mutex_unlock(&dvb->lock);
 	dprintk(DBGLVL_DVB, "%s(port=%d) now feeding = %d\n",
 		__func__, port->nr, dvb->feeding);
-	}
 
 	return ret;
 }
@@ -266,7 +264,6 @@ static int saa7164_dvb_stop_feed(struct dvb_demux_feed *feed)
 
 	dprintk(DBGLVL_DVB, "%s(port=%d)\n", __func__, port->nr);
 
-	if (dvb) {
 	mutex_lock(&dvb->lock);
 	if (--dvb->feeding == 0) {
 		/* Stop transport */
@@ -275,7 +272,6 @@ static int saa7164_dvb_stop_feed(struct dvb_demux_feed *feed)
 	mutex_unlock(&dvb->lock);
 	dprintk(DBGLVL_DVB, "%s(port=%d) now feeding = %d\n",
 		__func__, port->nr, dvb->feeding);
-	}
 
 	return ret;
 }