regression from commit 5f15cc01
"new loplugin: use more efficient find() methods"

Regression found by Aron Budea.

Change-Id: I0e84376dfd754738de97882979058f86c2476bd6
Reviewed-on: https://gerrit.libreoffice.org/34600Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Julien Nabet <serval2412@yahoo.fr>