image: potential fd leak in err case

without this patch, fd will not be freeed

* Changelog from v1:
	* just free fd, no crt.ids
Signed-off-by: Libo Chen <libo.chen@huawei.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

image.c

@@ -74,8 +74,10 @@ int write_img_inventory(void)
 
 	crt.state = TASK_ALIVE;
 	crt.pid.real = getpid();
-	if (get_task_ids(&crt))
+	if (get_task_ids(&crt)){
+		close(fd);
 		return -1;
+	}
 
 	he.root_ids = crt.ids;