media: fix integer as NULL pointer warnings

index 5040d7f..1371b4e 100644
@@ -119,7 +119,7 @@ static int start_urb_transfer(struct au0828_dev *dev)
 		purb->transfer_buffer = kzalloc(URB_BUFSIZE, GFP_KERNEL);
 		if (!purb->transfer_buffer) {
 			usb_free_urb(purb);
-			dev->urbs[i] = 0;
+			dev->urbs[i] = NULL;
 			goto err;
 		}
 

index 393d917..62f70bd 100644
@@ -1098,8 +1098,8 @@ void ivtv_yuv_setup_stream_frame(struct ivtv *itv)
 	ivtv_yuv_next_free(itv);
 
 	/* Copy V4L2 parameters to an ivtv_dma_frame struct... */
-	dma_args.y_source = 0L;
-	dma_args.uv_source = 0L;
+	dma_args.y_source = NULL;
+	dma_args.uv_source = NULL;
 	dma_args.src.left = 0;
 	dma_args.src.top = 0;
 	dma_args.src.width = yi->v4l2_src_w;

index 9a7c8e9..8d859cc 100644
@@ -75,7 +75,7 @@ static void set_stereo(struct pvr2_msp3400_handler *ctxt)
 	pvr2_trace(PVR2_TRACE_CHIPS,"i2c msp3400 v4l2 set_stereo");
 
 	if ((sid < ARRAY_SIZE(routing_schemes)) &&
-	    ((sp = routing_schemes + sid) != 0) &&
+	    ((sp = routing_schemes + sid) != NULL) &&
 	    (hdw->input_val >= 0) &&
 	    (hdw->input_val < sp->cnt)) {
 		route.input = sp->def[hdw->input_val];

index b5db6a5..73dcb1c 100644
@@ -195,7 +195,7 @@ static int pvr2_context_thread_func(void *foo)
 int pvr2_context_global_init(void)
 {
 	pvr2_context_thread_ptr = kthread_run(pvr2_context_thread_func,
-					      0,
+					      NULL,
 					      "pvrusb2-context");
 	return (pvr2_context_thread_ptr ? 0 : -ENOMEM);
 }

index 97350b0..29d5059 100644
@@ -123,7 +123,7 @@ static void set_input(struct pvr2_v4l_cx2584x *ctxt)
 	memset(&route,0,sizeof(route));
 
 	if ((sid < ARRAY_SIZE(routing_schemes)) &&
-	    ((sp = routing_schemes + sid) != 0) &&
+	    ((sp = routing_schemes + sid) != NULL) &&
 	    (hdw->input_val >= 0) &&
 	    (hdw->input_val < sp->cnt)) {
 		vid_input = sp->def[hdw->input_val].vid;

index 2e64f98..6504c97 100644
@@ -130,7 +130,7 @@ static void pvr2_dvb_stream_end(struct pvr2_dvb_adapter *adap)
 		for (idx = 0; idx < PVR2_DVB_BUFFER_COUNT; idx++) {
 			if (!(adap->buffer_storage[idx])) continue;
 			kfree(adap->buffer_storage[idx]);
-			adap->buffer_storage[idx] = 0;
+			adap->buffer_storage[idx] = NULL;
 		}
 		adap->stream_run = 0;
 	}

@@ -142,7 +142,7 @@ static int pvr2_dvb_stream_do_start(struct pvr2_dvb_adapter *adap)
 	unsigned int idx;
 	int ret;
 	struct pvr2_buffer *bp;
-	struct pvr2_stream *stream = 0;
+	struct pvr2_stream *stream = NULL;
 
 	if (adap->stream_run) return -EIO;
 

@@ -174,7 +174,7 @@ static int pvr2_dvb_stream_do_start(struct pvr2_dvb_adapter *adap)
 	ret = pvr2_hdw_set_streaming(adap->channel.hdw, 1);
 	if (ret < 0) return ret;
 
-	while ((bp = pvr2_stream_get_idle_buffer(stream)) != 0) {
+	while ((bp = pvr2_stream_get_idle_buffer(stream)) != NULL) {
 		ret = pvr2_buffer_queue(bp);
 		if (ret < 0) return ret;
 	}

index 087a182..e9b5d4e 100644
@@ -1261,7 +1261,7 @@ struct pvr2_v4l2 *pvr2_v4l2_create(struct pvr2_context *mnp)
  fail:
 	pvr2_trace(PVR2_TRACE_STRUCT,"Failure creating pvr2_v4l2 id=%p",vp);
 	pvr2_v4l2_destroy_no_lock(vp);
-	return 0;
+	return NULL;
 }
 
 /*

index 7c47345..2433a31 100644
@@ -81,7 +81,7 @@ static void set_input(struct pvr2_v4l_decoder *ctxt)
 	pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 set_input(%d)",hdw->input_val);
 
 	if ((sid < ARRAY_SIZE(routing_schemes)) &&
-	    ((sp = routing_schemes + sid) != 0) &&
+	    ((sp = routing_schemes + sid) != NULL) &&
 	    (hdw->input_val >= 0) &&
 	    (hdw->input_val < sp->cnt)) {
 		route.input = sp->def[hdw->input_val];

index 34deb68..7cc42c1 100644
@@ -716,7 +716,7 @@ int v4l2_i2c_attach(struct i2c_adapter *adapter, int address, struct i2c_driver
 	int err;
 
 	client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
-	if (client == 0)
+	if (!client)
 		return -ENOMEM;
 
 	client->addr = address;

index fc51e49..982f446 100644
@@ -97,7 +97,10 @@ int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
 void *videobuf_queue_to_vmalloc (struct videobuf_queue *q,
 			   struct videobuf_buffer *buf)
 {
-	return CALL(q, vmalloc, buf);
+	if (q->int_ops->vmalloc)
+		return q->int_ops->vmalloc(buf);
+	else
+		return NULL;
 }
 EXPORT_SYMBOL_GPL(videobuf_queue_to_vmalloc);