dma: mv_xor: remove useless backpointer from mv_xor_chan to mv_xor_device

The backpointer from mv_xor_chan to mv_xor_device is now useless, get
rid of it.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>

drivers/dma/mv_xor.c

@@ -1118,7 +1118,6 @@ mv_xor_channel_add(struct mv_xor_device *xordev,
 
 	/* discover transaction capabilites from the platform data */
 	dma_dev->cap_mask = cap_mask;
-	mv_chan->shared = xordev;
 
 	INIT_LIST_HEAD(&dma_dev->channels);
 

drivers/dma/mv_xor.h

@@ -87,7 +87,6 @@ struct mv_xor_chan {
 	void			*dma_desc_pool_virt;
 	size_t                  pool_size;
 	struct dma_device	dmadev;
-	struct mv_xor_device	*shared;
 	struct dma_chan		dmachan;
 	struct mv_xor_desc_slot	*last_used;
 	struct list_head	all_slots;