dma: use BUG_ON correctly in mv_xor.c, v4

This patch makes BUG_ON() usage correct in drivers/dma/mv_xor.c

Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NColy Li <bosong.ly@taobao.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>

drivers/dma/mv_xor.c

@@ -671,7 +671,7 @@ mv_xor_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
 	if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
 		return NULL;
 
-	BUG_ON(unlikely(len > MV_XOR_MAX_BYTE_COUNT));
+	BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
 
 	spin_lock_bh(&mv_chan->lock);
 	slot_cnt = mv_chan_memcpy_slot_count(len);
@@ -710,7 +710,7 @@ mv_xor_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value,
 	if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
 		return NULL;
 
-	BUG_ON(unlikely(len > MV_XOR_MAX_BYTE_COUNT));
+	BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
 
 	spin_lock_bh(&mv_chan->lock);
 	slot_cnt = mv_chan_memset_slot_count(len);
@@ -744,7 +744,7 @@ mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
 	if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
 		return NULL;
 
-	BUG_ON(unlikely(len > MV_XOR_MAX_BYTE_COUNT));
+	BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
 
 	dev_dbg(mv_chan->device->common.dev,
 		"%s src_cnt: %d len: dest %x %u flags: %ld\n",