coredump: really extract container cmdline (#5167)
Fixes: ``` root# systemd-nspawn -D ./cont/ --register=no /bin/sh -c '/bin/sh -c "kill -ABRT \$\$"' ... Container cont failed with error code 134. root# journalctl MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1 -o verbose | grep -i container_cmdline ...prints nothing... ...should be COREDUMP_CONTAINER_CMDLINE=systemd-nspawn -D ./cont/ --register=no /bin/sh -c /bin/sh -c "kill -ABRT \$\$" ``` Also, fixes CID #1368263 ``` ==352== 130 bytes in 1 blocks are definitely lost in loss record 1 of 2 ==352== at 0x4C2ED5F: realloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==352== by 0x4ED8581: greedy_realloc (alloc-util.c:57) ==352== by 0x4ECAAD5: get_process_cmdline (process-util.c:147) ==352== by 0x10E385: get_process_container_parent_cmdline (coredump.c:645) ==352== by 0x112949: process_kernel (coredump.c:1240) ==352== by 0x113003: main (coredump.c:1297) ==352== ``` (cherry picked from commit d3cba4ea)
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