staging: rdma: Replace kmalloc with kmalloc_array

Replace kmalloc with specialized function kmalloc_array
when the size is a multiplication of:
	number_of_elements * size_of_element
Signed-off-by: Cristina Moraru <cristina.moraru09@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rdma/amso1100/c2_provider.c

@@ -462,7 +462,7 @@ static struct ib_mr *c2_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
 	shift = ffs(c2mr->umem->page_size) - 1;
 	n = c2mr->umem->nmap;
 
-	pages = kmalloc(n * sizeof(u64), GFP_KERNEL);
+	pages = kmalloc_array(n, sizeof(u64), GFP_KERNEL);
 	if (!pages) {
 		err = -ENOMEM;
 		goto err;

drivers/staging/rdma/ipath/ipath_verbs.c

@@ -2025,8 +2025,8 @@ int ipath_register_ib_device(struct ipath_devdata *dd)
 	dev = &idev->ibdev;
 
 	if (dd->ipath_sdma_descq_cnt) {
-		tx = kmalloc(dd->ipath_sdma_descq_cnt * sizeof *tx,
-			     GFP_KERNEL);
+		tx = kmalloc_array(dd->ipath_sdma_descq_cnt, sizeof *tx,
+				   GFP_KERNEL);
 		if (tx == NULL) {
 			ret = -ENOMEM;
 			goto err_tx;