s390x: Fix memory leaks related to loadparm [rhel-10]

Thomas Huthrequested to merge
thuth/qemu-kvm-cs:RHEL-98555 into c10s

JIRA: https://issues.redhat.com/browse/RHEL-98555

Fix two small memory leaks discovered with valgrind.

Resolves: RHEL-98555

Signed-off-by: Thomas Huth thuth@redhat.com

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