mbox: Added extra assert

diff --git a/src/lib-storage/index/mbox/mbox-sync-rewrite.c b/src/lib-storage/index/mbox/mbox-sync-rewrite.c
index b32083f32dcb0ec9c1836681a699f89e577d55ce..e8bba88cf3b2d2482590cf92dada0531d5982b6f 100644 (file)
--- a/src/lib-storage/index/mbox/mbox-sync-rewrite.c
+++ b/src/lib-storage/index/mbox/mbox-sync-rewrite.c
@@ -19,6 +19,7 @@ int mbox_move(struct mbox_sync_context *sync_ctx,
        struct ostream *output;
        off_t ret;
 
+       i_assert(source > 0 || (dest != 1 && dest != 2));
        i_assert(size < OFF_T_MAX);
 
        if (size == 0 || source == dest)