drm/exynos: fix pages allocation size in lowlevel_buffer_allocate

When IOMMU is not supported, buf->pages has to be allocated to
assign the result of phys_to_page() which return type is struct
page *. So it is sufficient to allocate buf->pages with the size
of multiple struct page pointers.

Signed-off-by: YoungJun Cho <yj44.cho@samsung.com>
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_buf.c

@@ -57,7 +57,7 @@ static int lowlevel_buffer_allocate(struct drm_device *dev,
 		dma_addr_t start_addr;
 		unsigned int i = 0;
 
-		buf->pages = drm_calloc_large(nr_pages, sizeof(struct page));
+		buf->pages = drm_calloc_large(nr_pages, sizeof(struct page *));
 		if (!buf->pages) {
 			DRM_ERROR("failed to allocate pages.\n");
 			return -ENOMEM;