Fix error handling in return from list_to_instances(). Coverity #123
Fix error handling in return from list_to_instances().
Coverity #123

	modified:   src/cpan/MMV/MMV.xs

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