dma-mapping: remove a pointless empty line in dma_alloc_coherent

Signed-off-by: Wang Qing <wangqing@vivo.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

include/linux/dma-mapping.h

@@ -435,7 +435,6 @@ static inline void dma_sync_sgtable_for_device(struct device *dev,
 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 		dma_addr_t *dma_handle, gfp_t gfp)
 {
-
 	return dma_alloc_attrs(dev, size, dma_handle, gfp,
 			(gfp & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0);
 }