media: tm6000: cleanup trival coding style issues

- Delete seven error messages for a failed memory allocation
- Adjust seven checks for null pointers
- Use common error handling code in tm6000_usb_probe()
- Adjust jump targets so that the function "kfree" will be always called
  with a non-null pointer.
- Delete an initialisation for the local variable "dev"
  which became unnecessary with this refactoring.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/usb/tm6000/tm6000-dvb.c

@@ -123,7 +123,7 @@ static int tm6000_start_stream(struct tm6000_core *dev)
 	}
 
 	dvb->bulk_urb = usb_alloc_urb(0, GFP_KERNEL);
-	if (dvb->bulk_urb == NULL)
+	if (!dvb->bulk_urb)
 		return -ENOMEM;
 
 	pipe = usb_rcvbulkpipe(dev->udev, dev->bulk_in.endp->desc.bEndpointAddress
@@ -133,9 +133,8 @@ static int tm6000_start_stream(struct tm6000_core *dev)
 	size = size * 15; /* 512 x 8 or 12 or 15 */
 
 	dvb->bulk_urb->transfer_buffer = kzalloc(size, GFP_KERNEL);
-	if (dvb->bulk_urb->transfer_buffer == NULL) {
+	if (!dvb->bulk_urb->transfer_buffer) {
 		usb_free_urb(dvb->bulk_urb);
-		printk(KERN_ERR "tm6000: couldn't allocate transfer buffer!\n");
 		return -ENOMEM;
 	}
 
@@ -361,7 +360,7 @@ static void unregister_dvb(struct tm6000_core *dev)
 {
 	struct tm6000_dvb *dvb = dev->dvb;
 
-	if (dvb->bulk_urb != NULL) {
+	if (dvb->bulk_urb) {
 		struct urb *bulk_urb = dvb->bulk_urb;
 
 		kfree(bulk_urb->transfer_buffer);
@@ -400,10 +399,8 @@ static int dvb_init(struct tm6000_core *dev)
 	}
 
 	dvb = kzalloc(sizeof(struct tm6000_dvb), GFP_KERNEL);
-	if (!dvb) {
-		printk(KERN_INFO "Cannot allocate memory\n");
+	if (!dvb)
 		return -ENOMEM;
-	}
 
 	dev->dvb = dvb;