Older log files not deleted after being compressed and rotated

Issue

• Old log file is still present after rotation:

-rw-r--r-- 1 root root 206983237 Dec 13 03:16 log.nmbd-20151213
-rw-r--r-- 1 root root  40219811 Dec 13 03:16 log.nmbd.old.gz-20151213