src/pmlogconf/pmlogconf.c: fix a couple of compilation warnings
src/pmlogconf/pmlogconf.c: fix a couple of compilation warnings

Check return values from fchown() and ftruncate().

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp