Fixed problem when start_unit_scan() is called with NULL argument
diff --git a/board/ACube/common/sys_dep.c b/board/ACube/common/sys_dep.c
index ff58686..3057323 100644
--- a/board/ACube/common/sys_dep.c
+++ b/board/ACube/common/sys_dep.c
@@ -149,7 +149,7 @@
const char ** opt_list;
struct dev_access_entry * dae_found;
//printf("entered start_unit_scan\n");
-
+ if (!scan_list || !blocksize) return NULL;
//floppy_like_an_hd.block_read = internal_floppy_block_read;
/* This routine builds a list of scan handles from the env-vars passed in scan_list. */
