swiotlb: remove unnecessary declaration

Impact: cleanup

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

lib/swiotlb.c

@@ -22,7 +22,6 @@
 #include <linux/mm.h>
 #include <linux/module.h>
 #include <linux/spinlock.h>
-#include <linux/swiotlb.h>
 #include <linux/string.h>
 #include <linux/swiotlb.h>
 #include <linux/pfn.h>
@@ -777,8 +776,6 @@ swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
 				  SYNC_FOR_DEVICE);
 }
 
-void swiotlb_unmap_sg_attrs(struct device *, struct scatterlist *, int, int,
-			    struct dma_attrs *);
 /*
  * Map a set of buffers described by scatterlist in streaming mode for DMA.
  * This is the scatter-gather version of the above swiotlb_map_single