qa/src/interp3.c: free() the *alloc()s from main
qa/src/interp3.c: free() the *alloc()s from main

Avoids confusing valgrind in some places, like vm25 (x86_64
CentOS 5.5).

tjanez/pcp,edwardt/pcp,andyvand/cygpcpfans,prasincs/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp,andyvand/cygpcpfans,edwardt/pcp,adfernandes/pcp,andyvand/cygpcpfans,prasincs/pcp,edwardt/pcp,edwardt/pcp,tjanez/pcp,adfernandes/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,andyvand/cygpcpfans,wuliming/pcp,wuliming/pcp,tjanez/pcp,prasincs/pcp,aeg-aeg/pcpfans,prasincs/pcp,aeg-aeg/pcpfans,edwardt/pcp,andyvand/cygpcpfans,adfernandes/pcp,wuliming/pcp,tjanez/pcp,aeg-aeg/pcpfans,tjanez/pcp,edwardt/pcp,adfernandes/pcp,tjanez/pcp,tjanez/pcp,edwardt/pcp,aeg-aeg/pcpfans,prasincs/pcp,adfernandes/pcp,andyvand/cygpcpfans,aeg-aeg/pcpfans,edwardt/pcp,wuliming/pcp,wuliming/pcp,aeg-aeg/pcpfans,prasincs/pcp,wuliming/pcp,andyvand/cygpcpfans,prasincs/pcp,adfernandes/pcp,adfernandes/pcp,tjanez/pcp,prasincs/pcp,aeg-aeg/pcpfans