drm: drm_debugfs, check kmalloc retval

Check kmalloc return value in drm_debugfs_create_files and bail out
appropriately if the pointer is NULL.
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Signed-off-by: NDave Airlie <airlied@linux.ie>

drivers/gpu/drm/drm_debugfs.c

@@ -101,6 +101,10 @@ int drm_debugfs_create_files(struct drm_info_list *files, int count,
 			continue;
 
 		tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
+		if (tmp == NULL) {
+			ret = -1;
+			goto fail;
+		}
 		ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
 					  root, tmp, &drm_debugfs_fops);
 		if (!ent) {