block: Drop superfluous conditionals around g_free()
Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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