minitramfs: find/cpio exit codes ignored while building initramfs

The final stage of mkinitramfs that builds the image does not verify the
exit codes of find or cpio:

(cd "${DESTDIR}" && find . | cpio --quiet --dereference -o -H newc | gzip
>"${outfile}") || exit 1

Once bug 514936 is solved, this will be even more important, since cpio
will actually return errors.

Attached is a gross alternative to depending on bash...

Current behavior:

$ find /fail | cpio --quiet --dereference -o -H newc | gzip > /tmp/archive.gz
find: `/fail': No such file or directory
$ echo $?
0

Desired behavior:

$ set -o pipefail
$ find /fail | cpio --quiet --dereference -o -H newc | gzip > /tmp/archive.gz
find: `/fail': No such file or directory
$ echo $?
1


(closes: #514938)

[ already useful in finding stupid mkinitramfs path errors -maks ]

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