prevent a potential but currently impossible segfault that could happen when an fs...

diff --git a/gpsbabel/formspec.c b/gpsbabel/formspec.c
index 1c20c53c9359a10291dbb13185ea528c88409da9..ce1dbf90b550549bc3fef292d2812e8256dc47b5 100644 (file)
--- a/gpsbabel/formspec.c
+++ b/gpsbabel/formspec.c
@@ -31,6 +31,8 @@ format_specific_data *fs_chain_copy( format_specific_data *source ) {
        format_specific_data **copy = &result;
        while ( source ) {
                source->copy( (void **)copy, (void *)source );
+               /* prevent segfaults from badly-behaved copy functions */
+               (*copy)->next = NULL; 
                copy = &((*copy)->next);
                source = source->next;
        }