fs/proc/loadavg.c: Changed /proc/loadavg perms to 0444, so it can be opened in non-root containers
- Fixed incorrect logic in the code and in doing so, removed the used of goto
- Removed usless substitutions with actual hardcoded string
fs/proc/loadavg.c: Moved the struct definitions to the begining of  loadavg_proc_show()
fs/proc/loadavg.c: Added <linux/cgroup.h> for the task_css() function