refs #6431 Fixing stricter compiler nits.
refs #6431 Fixing stricter compiler nits.

dbpercona/Percona-TokuBackup,dbpercona/Percona-TokuBackup,tplavcic/Percona-TokuBackup,Jun-Yuan/Percona-TokuBackup,Jun-Yuan/Percona-TokuBackup,guiquanz/Percona-TokuBackup,percona/Percona-TokuBackup,percona/Percona-TokuBackup,percona/Percona-TokuBackup,percona/Percona-TokuBackup,dbpercona/Percona-TokuBackup,dbpercona/Percona-TokuBackup,kbauskar/Percona-TokuBackup,kbauskar/Percona-TokuBackup,tplavcic/Percona-TokuBackup,guiquanz/Percona-TokuBackup,Jun-Yuan/Percona-TokuBackup,guiquanz/Percona-TokuBackup,kbauskar/Percona-TokuBackup,kbauskar/Percona-TokuBackup,tplavcic/Percona-TokuBackup,tplavcic/Percona-TokuBackup,guiquanz/Percona-TokuBackup,Jun-Yuan/Percona-TokuBackup