bug#72770: stat: filesystem ID regression in 9.5 with musl libc

[Natanael Copa]

With coreutils 9.5 stat -f -c %i returns wrong value with musl libc.

$ docker run --rm -it -v /tmp:/tmp alpine:3.20 sh -c "apk add --quiet coreutils 
&& stat --version && stat -f -c %i /tmp && busybox stat -f -c %i /tmp"
stat (GNU coreutils) 9.5
Copyright (C) 2024 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Michael Meskes.
4dc59e8900000000
4dc59e89680d9b7c

Coreutils returns 4dc59e8900000000 instead of the expected 4dc59e89680d9b7c.

With 9.4 this works as expected:

$ docker run --rm -it -v /tmp:/tmp alpine:3.19 sh -c "apk add --quiet coreutils 
&& stat --version && stat -f -c %i /tmp && busybox stat -f -c %i /tmp"
stat (GNU coreutils) 9.4
Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Michael Meskes.
4dc59e89680d9b7c
4dc59e89680d9b7c

Downstream report: https://gitlab.alpinelinux.org/alpine/aports/-/issues/16386