[media] v4l2: vb2-dma-sg: fix memory leak

This patch fixes two minor memory leaks in videobuf2-dma-sg module. They
might happen only in case some other operations (like memory allocation)
failed.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/videobuf2-dma-sg.c

@@ -88,6 +88,7 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size)
 fail_pages_alloc:
 	while (--i >= 0)
 		__free_page(buf->pages[i]);
+	kfree(buf->pages);
 
 fail_pages_array_alloc:
 	vfree(buf->sg_desc.sglist);
@@ -176,6 +177,7 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr,
 	       num_pages_from_user, buf->sg_desc.num_pages);
 	while (--num_pages_from_user >= 0)
 		put_page(buf->pages[num_pages_from_user]);
+	kfree(buf->pages);
 
 userptr_fail_pages_array_alloc:
 	vfree(buf->sg_desc.sglist);