remove unused "caller" arg from stringToQualifiedNameList

This function seems to have an argument that is no longer used (probably
leftover from when it used to report an error message?).  This rather
trivial patch removes it and fixes associated fallout.

--
Alvaro Herrera                        http://www.advogato.org/person/alvherre
"Before you were born your parents weren't as boring as they are now. They
got that way paying your bills, cleaning up your room and listening to you
tell them how idealistic you are."  -- Charles J. Sykes' advice to teenagers