IB/usnic: Remove unused DMA attributes

The DMA attributes are set but never used.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/usnic/usnic_uiom.c

@@ -36,7 +36,6 @@
 #include <linux/dma-mapping.h>
 #include <linux/sched.h>
 #include <linux/hugetlb.h>
-#include <linux/dma-attrs.h>
 #include <linux/iommu.h>
 #include <linux/workqueue.h>
 #include <linux/list.h>
@@ -112,10 +111,6 @@ static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
 	int i;
 	int flags;
 	dma_addr_t pa;
-	DEFINE_DMA_ATTRS(attrs);
-
-	if (dmasync)
-		dma_set_attr(DMA_ATTR_WRITE_BARRIER, &attrs);
 
 	if (!can_do_mlock())
 		return -EPERM;