packaging: setup: ssl2jkstrust: do not try to rename if no source

Related-To: https://bugzilla.redhat.com/show_bug.cgi?id=1058016
Change-Id: Ibae6aaff3cff8f056a80ad96494b06f5a70e3f54
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>