In can_expand_fs_on_volume(), check for an FSIM before calling the FSIM's
can_expand_by() routine.

--- evms-2.3.4a/engine/expand.c	28 May 2004 22:08:01 -0000
+++ evms-2.3.4b/engine/expand.c	21 Jun 2004 14:54:57 -0000
@@ -165,7 +165,8 @@
 		usable_object_size = vol->object->size - EVMS_FEATURE_HEADER_SECTORS * 2;
 	}
 
-	if (vol->vol_size < usable_object_size) {
+	if (vol->vol_size < usable_object_size &&
+	    vol->file_system_manager) {
 		expand_size = usable_object_size - vol->fs_size;
 		rc = vol->file_system_manager->functions.fsim->can_expand_by(vol, &expand_size);