od -j1 /dev/null fails

[oech3]

> od .
od: I/O: Is a directory (os error 21)
> gnu58d88d243/od .
od: .: Is a directory
0000000

[edit] see #11494 (comment)

[oech3]

Should we really show 0000000? @pixelb

[pixelb]

Should we really show 0000000? @pixelb

Well folks may be using that to do base conversion?

$ od -Ax -j100 /dev/null
000064

[oech3]

> uutils-od -Ax -j100 /dev/null
od: tried to skip past end of input
000064 #(exit 1)

[pixelb]

Given neither od --strings . or od foo output an address, we should do the same for od .
I'll make that change upstream in GNU