coredump: fix message when we fail to save a journald coredump

coredump: fix message when we fail to save a journald coredump

If creation of the message failed, we'd write a bogus entry:
systemd-coredump[1400]: Cannot store coredump of 416 (systemd-journal): No space left on device
systemd-coredump[1400]: MESSAGE=Process 416 (systemd-journal) of user 0 dumped core.
systemd-coredump[1400]: Coredump diverted to

(cherry picked from commit f0136e09221364f931c3a3b715da4e4d3ee9f2ac)
(cherry picked from commit 3f11736ae9f336ddbc34ad395c9fe5c99139af39)

Gbp-Pq: Name coredump-fix-message-when-we-fail-to-save-a-journald-core.patch