Staging: gasket: Use DIV_ROUND_UP

Use DIV_ROUND_UP in-kernel function to make code simple and more
understandable.

Issue found using Coccinelle.
Signed-off-by: Madhumitha Prabakaran <madhumithabiw@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gasket/gasket_page_table.c

@@ -768,8 +768,7 @@ static bool gasket_is_extended_dev_addr_bad(struct gasket_page_table *pg_tbl,
 	page_lvl0_idx = gasket_extended_lvl0_page_idx(pg_tbl, dev_addr);
 
 	/* Get the count of affected level 0 pages. */
-	num_lvl0_pages = (num_pages + GASKET_PAGES_PER_SUBTABLE - 1) /
-		GASKET_PAGES_PER_SUBTABLE;
+	num_lvl0_pages = DIV_ROUND_UP(num_pages, GASKET_PAGES_PER_SUBTABLE);
 
 	if (gasket_components_to_dev_address(pg_tbl, 0, page_global_idx,
 					     page_offset) != dev_addr) {
@@ -1258,7 +1257,7 @@ int gasket_alloc_coherent_memory(struct gasket_dev *gasket_dev, u64 size,
 	dma_addr_t handle;
 	void *mem;
 	int j;
-	unsigned int num_pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
+	unsigned int num_pages = DIV_ROUND_UP(size, PAGE_SIZE);
 	const struct gasket_driver_desc *driver_desc =
 		gasket_get_driver_desc(gasket_dev);