dma: use BUG_ON correctly in ppc4xx/adam.c, v4

This patch makes BUG_ON() usage correct in drivers/dma/ppc4xx/adam.c

Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Sean MacLennan <smaclennan@pikatech.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: NColy Li <bosong.ly@taobao.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>

drivers/dma/ppc4xx/adma.c

@@ -2313,7 +2313,7 @@ static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_memcpy(
 	if (unlikely(!len))
 		return NULL;
 
-	BUG_ON(unlikely(len > PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT));
+	BUG_ON(len > PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT);
 
 	spin_lock_bh(&ppc440spe_chan->lock);
 
@@ -2354,7 +2354,7 @@ static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_memset(
 	if (unlikely(!len))
 		return NULL;
 
-	BUG_ON(unlikely(len > PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT));
+	BUG_ON(len > PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT);
 
 	spin_lock_bh(&ppc440spe_chan->lock);
 
@@ -2397,7 +2397,7 @@ static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_xor(
 				     dma_dest, dma_src, src_cnt));
 	if (unlikely(!len))
 		return NULL;
-	BUG_ON(unlikely(len > PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT));
+	BUG_ON(len > PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT);
 
 	dev_dbg(ppc440spe_chan->device->common.dev,
 		"ppc440spe adma%d: %s src_cnt: %d len: %u int_en: %d\n",
@@ -2887,7 +2887,7 @@ static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_pq(
 	ADMA_LL_DBG(prep_dma_pq_dbg(ppc440spe_chan->device->id,
 				    dst, src, src_cnt));
 	BUG_ON(!len);
-	BUG_ON(unlikely(len > PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT));
+	BUG_ON(len > PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT);
 	BUG_ON(!src_cnt);
 
 	if (src_cnt == 1 && dst[1] == src[0]) {