Differentiate between PM_ERR_INST and PM_ERR_PMID in pmdammv.
Differentiate between PM_ERR_INST and PM_ERR_PMID in pmdammv.

The return code from the fetch callback was being unilaterally
set to PM_ERR_PMID in pmdammv, if its just an instance missing
we can now tell (and thats less of an issue).  Parfait writes
such mmv(4) files, sometimes; checking with Cowan whether that
is expected behaviour there or not (not ideal obviously but it
may be unavoidable).

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