freebsd PMDA - improved error handling in initialization
freebsd PMDA - improved error handling in initialization

Low risk, but removes a compilation warning and a possible run-time
error later on.

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