IB/mthca: Replace memset(<addr>, 0, PAGE_SIZE) with clear_page(<addr>)

Signed-off-by: Shani Moideen <shani.moideen@wipro.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
----

diff --git a/drivers/infiniband/hw/mthca/mthca_allocator.c b/drivers/infiniband/hw/mthca/mthca_allocator.c
index f930e55..a763067 100644
--- a/drivers/infiniband/hw/mthca/mthca_allocator.c
+++ b/drivers/infiniband/hw/mthca/mthca_allocator.c
@@ -255,7 +255,7 @@
 			dma_list[i] = t;
 			pci_unmap_addr_set(&buf->page_list[i], mapping, t);
 
-			memset(buf->page_list[i].buf, 0, PAGE_SIZE);
+			clear_page(buf->page_list[i].buf);
 		}
 	}