/dev/null is permission 400 in rawhide

[Linus Walleij <triad df lth se>]

This problem came in today:

bash-3.2$ ls -al /dev/null
cr-------- 1 root root 1, 3 28 dec 21.32 /dev/null

Anyone else hit by it and knows the reason for? (Nothing much else 
than rootshell works, manual chmod to the rescue.)

I suspect the glibc update, but I have actually no idea what update caused 
this.

Linus