Cleanup: remove used FileData flag

Pull Request: https://projects.blender.org/blender/blender/pulls/124784

source/blender/blenloader/intern/readfile.cc

@@ -1367,7 +1367,7 @@ void blo_filedata_free(FileData *fd)
   if (fd->globmap) {
     oldnewmap_free(fd->globmap);
   }
-  if (fd->libmap && !(fd->flags & FD_FLAGS_NOT_MY_LIBMAP)) {
+  if (fd->libmap) {
     oldnewmap_free(fd->libmap);
   }
   if (fd->old_idmap_uid != nullptr) {

source/blender/blenloader/intern/readfile.hh

@@ -43,10 +43,8 @@ enum eFileDataFlag {
   FD_FLAGS_POINTSIZE_DIFFERS = 1 << 2,
   FD_FLAGS_FILE_OK = 1 << 3,
   FD_FLAGS_IS_MEMFILE = 1 << 4,
-  /* XXX Unused in practice (checked once but never set). */
-  FD_FLAGS_NOT_MY_LIBMAP = 1 << 5,
 };
-ENUM_OPERATORS(eFileDataFlag, FD_FLAGS_NOT_MY_LIBMAP)
+ENUM_OPERATORS(eFileDataFlag, FD_FLAGS_IS_MEMFILE)
 
 /* Disallow since it's 32bit on ms-windows. */
 #ifdef __GNUC__