[media] bt8xx: remove needless check

As reported by smatch:
	drivers/media/pci/bt8xx/dst_ca.c:323 ca_get_message() warn: this array is probably non-NULL. 'p_ca_message->msg'
	drivers/media/pci/bt8xx/dst_ca.c:498 ca_send_message() warn: this array is probably non-NULL. 'p_ca_message->msg'

Those two checks are needless/useless, as the ca_msg struct is
declared as:
typedef struct ca_msg {
        unsigned int index;
        unsigned int type;
        unsigned int length;
        unsigned char msg[256];
} ca_msg_t;

So, if the p_ca_message pointer is not null, msg will also be
not null.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/pci/bt8xx/dst_ca.c

@@ -320,7 +320,6 @@ static int ca_get_message(struct dst_state *state, struct ca_msg *p_ca_message,
 	if (copy_from_user(p_ca_message, arg, sizeof (struct ca_msg)))
 		return -EFAULT;
 
-	if (p_ca_message->msg) {
 	dprintk(verbose, DST_CA_NOTICE, 1, " Message = [%*ph]",
 		3, p_ca_message->msg);
 
@@ -343,7 +342,6 @@ static int ca_get_message(struct dst_state *state, struct ca_msg *p_ca_message,
 			return -EFAULT;
 		break;
 	}
-	}
 
 	return 0;
 }
@@ -494,8 +492,6 @@ static int ca_send_message(struct dst_state *state, struct ca_msg *p_ca_message,
 		goto free_mem_and_exit;
 	}
 
-
-	if (p_ca_message->msg) {
 	/*	EN50221 tag	*/
 	command = 0;
 
@@ -547,7 +543,7 @@ static int ca_send_message(struct dst_state *state, struct ca_msg *p_ca_message,
 		dprintk(verbose, DST_CA_INFO, 1, " -->CA_INFO_ENQUIRY Success !");
 		break;
 	}
-	}
+
 free_mem_and_exit:
 	kfree (hw_buffer);