dd: Illegal seek when doing: dd bs=1 skip=4 if=/sys/firmware/efi/efivars/SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c of=/tmp/foo

[quite]

uutils dd fails to skip some bytes when reading from the somewhat special efivars filesystem. Says Illegal seek. But not so; this use-case is for skipping the first 4 bytes of metadata, reading out only the actual variable contents. uutils dd ought to obey just as happily as GNU dd when asked to do this.

[oech3]

@pixelb same with #11557 ?