With a few tests I have discovered that when quitting Blender the filelist
in SpaceFile doesn't get free'd.
storage.c:
I have replaced strdup for the relname member in BLI_builddir with BLI_strdup.
and malloc with MEM_mallocN for the string member in BLI_addstrings().
filesel.c:
Of course also had to replace free with MEM_freeN in freefilelist().
In freespacelist (space.c) I added call to freefilelist for the SPACE_FILE
space type.
8a02dc11de