[media] drivers/media/dvb-frontends/s921.c: Removes useless kfree()

Remove useless kfree() and clean up code related to the removal.
The semantic patch that finds this problem is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@r exists@
position p1,p2;
expression x;
@@
if (x@p1 == NULL) { ... kfree@p2(x); ... return ...; }
@unchanged exists@
position r.p1,r.p2;
expression e <= r.x,x,e1;
iterator I;
statement S;
@@
if (x@p1 == NULL) { ... when != I(x,...) S
                        when != e = e1
                        when != e += e1
                        when != e -= e1
                        when != ++e
                        when != --e
                        when != e++
                        when != e--
                        when != &e
   kfree@p2(x); ... return ...; }
@ok depends on unchanged exists@
position any r.p1;
position r.p2;
expression x;
@@
... when != true x@p1 == NULL
kfree@p2(x);
@depends on !ok && unchanged@
position r.p2;
expression x;
@@
*kfree@p2(x);
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb-frontends/s921.c

@@ -487,9 +487,9 @@ struct dvb_frontend *s921_attach(const struct s921_config *config,
 		kzalloc(sizeof(struct s921_state), GFP_KERNEL);
 
 	dprintk("\n");
-	if (state == NULL) {
+	if (!state) {
 		rc("Unable to kzalloc\n");
-		goto rcor;
+		return NULL;
 	}
 
 	/* setup the state */
@@ -502,11 +502,6 @@ struct dvb_frontend *s921_attach(const struct s921_config *config,
 	state->frontend.demodulator_priv = state;
 
 	return &state->frontend;
-
-rcor:
-	kfree(state);
-
-	return NULL;
 }
 EXPORT_SYMBOL(s921_attach);