qemu: Resolve Coverity FORWARD_NULL
If we end up at the cleanup lable before we've VIR_EXPAND_N the list,
then calling virQEMUCapsFreeStringList() with a NULL proplist could
theoretically deref proplist if nproplist was set. Coverity doesn't
seem to acknowledge the relationship between proplist and nproplist
assuming in virQEMUCapsFreeStringList that nproplist could be at
least 1 and thus have a null deref. It only seems to follow the
NULL proplist.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
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